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In summary, the human body is made of 11 important organ systems, including the circulatory, respiratory, digestive, excretory, nervous and endocrine systems. They also include the immune, integumentary, skeletal, muscle and reproductive systems. The systems work together to maintain a functioning human body.

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Internal Organs | Human Body | Science Video Lecture

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The skins function is to protect your organs from outside invaders.

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The brain's function as part of the Central Nervous System (CNS) is to regulate the majority of our body and mind's functions. ... However, superior brain functions, like reasoning, memory, and attention, are controlled by the hemispheres and lobes that form part of the cortex.

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The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.Mar 22, 2016

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Breathing is taken for granted by most people. ... Oxygen enters our lungs as part of the air that we breathe. It goes to the blood vessels deep in our lungs and then on to all parts of our body. As our body uses oxygen, it makes a waste product called carbon dioxide.

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The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion. The pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.Mar 7, 2018

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The liver's main job is to filter the blood coming from the digestive tract, before passing it to the rest of the body. The liver also detoxifies chemicals and metabolizes 🤬. As it does so, the liver secretes bile that ends up back in the intestines.

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Functions of the small intestine. The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals from food.

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Major function of the large intestine. The majorfunction of the large intestine is to absorb water from the remaining indigestible food matter and transmit the useless waste material from the body

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The pancreas is an organ located in the abdomen. It plays an essential role in converting the food we eat into fuel for the body's cells. The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar.

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The main function of the muscular system is movement. Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular system's second function: the maintenance of posture and body position.

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The appendicular skeleton, which is attached to the axial skeleton, is formed by the shoulder girdle, the pelvic girdle and the bones of the upper and lower limbs. The human skeleton performs six major functions; support, movement, protection, production of blood cells, storage of minerals, and endocrine regulation.

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Part one

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Digestive System, Part 1: Crash Course Anatomy & Physiology #33

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Digestive System, Part 2: Crash Course Anatomy & Physiology #34

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I coped all of this so theres a link down below. Go and click it (NOT SPOSERD

Skin is made up of three layers. The outermost is the epidermis. This consists mainly of cells called keratinocytes, made from the tough protein keratin (also the material in hair and nails). Keratinocytes form several layers that constantly grow outwards as the exterior cells die and flake off.

Skin Information and Facts | National Geographic

https://www.nationalgeographic.com/science/health-and-human-body/human.../skin/

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still copyed so , LINK  👎👎👎👎👎👎👎👎👎👎👎👎In humans, it is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue and guards the underlying muscles, bones, ligaments and internal organs. Human skin is similar to that of most other mammals, and human skin is very similar to pig skin.

Human skin - Wikipedi

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The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue and guards the underlying muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals' skin, and it is very similar to pig skin. Though nearly all human skin is covered with hair follicles, it can appear hairless. There are two general types of skin, hairy and glabrous skin (hairless). The adjective cutaneous literally means "of the skin" (from Latin cutis, skin).

Because it interfaces with the environment, skin plays an important immunity role in protecting the body against pathogens and excessive water loss. Its other functions are insulation, temperature regulation, sensation, synthesis of vitamin D, and the protection of vitamin B folates. Severely damaged skin will try to heal by forming scar tissue. This is often discoloured and depigmented.

In humans, skin pigmentation varies among populations, and skin type can range from dry to non-dry and from oily to non-oily. Such skin variety provides a rich and diverse habitat for bacteria that number roughly 1000 species from 19 phyla, present on the human skin.

Human skin shares anatomical, physiological, biochemical and immunological properties with other mammalian lines, especially pig skin. Pig skin shares similar epidermal and dermal thickness ratios to human skin; pig and human skin share similar hair follicle and blood vessel patterns; biochemically the dermal collagen and elastic content is similar in pig and human skin; and pig skin and human skin have similar physical responses to various growth factors.

Skin has mesodermal cells, pigmentation, such as melanin provided by melanocytes, which absorb some of the potentially dangerous ultraviolet radiation (UV) in sunlight. It also contains DNA repair enzymes that help reverse UV damage, such that people lacking the genes for these enzymes suffer high rates of skin cancer. One form predominantly produced by UV light, malignant melanoma, is particularly invasive, causing it to spread quickly, and can often be deadly. Human skin pigmentation varies among populations in a striking manner. This has led to the classification of people(s) on the basis of skin colour.

In terms of surface area, the skin is the second largest organ in the human body (the inside of the small intestine is 15 to 20 times larger). For the average adult human, the skin has a surface area of between 1.5-2.0 square metres (16-22 sq ft). The thickness of the skin varies considerably over all parts of the body, and between men and women and the young and the old. An example is the skin on the forearm which is on average 1.3 mm in the male and 1.26 mm in the female. One average square inch (6.5 cm ²) of skin holds 650 sweat glands, 20 blood vessels, 60,000 melanocytes, and more than 1,000 nerve endings.[better source needed ] The average human skin cell is about 30 micrometres (μm) in diameter, but there are variants. A skin cell usually ranges from 25-40 μm ², depending on a variety of factors.

Skin is composed of three primary layers: the epidermis, the dermis and the hypodermis.

Epidermis, "epi" coming from the Greek meaning "over" or "upon", is the outermost layer of the skin. It forms the waterproof, protective wrap over the body's surface which also serves as a barrier to infection and is made up of stratified squamous epithelium with an underlying basal lamina.

The epidermis contains no blood vessels, and cells in the deepest layers are nourished almost exclusively by diffused oxygen from the surrounding air and to a far lesser degree by blood capillaries extending to the outer layers of the dermis. The main type of cells that make up the epidermis are Merkel cells, keratinocytes, with melanocytes and Langerhans cells also present. The epidermis can be further subdivided into the following strata (beginning with the outermost layer): corneum, lucidum (only in palms of hands and bottoms of feet), granulosum, spinosum, and basale. Cells are formed through mitosis at the basale layer. The daughter cells (see cell division) move up the strata changing shape and composition as they die due to isolation from their blood source. The cytoplasm is released and the protein keratin is inserted. They eventually reach the corneum and slough off ( desquamation). This process is called "keratinization". This keratinized layer of skin is responsible for keeping water in the body and keeping other harmful chemicals and pathogens out, making skin a natural barrier to infection.

The epidermis contains no blood vessels and is nourished by diffusion from the dermis. The main type of cells that make up the epidermis are keratinocytes, melanocytes, Langerhans cells, and Merkel cells. The epidermis helps the skin regulate body temperature.

The epidermis is divided into several layers, where cells are formed through mitosis at the innermost layers. They move up the strata changing shape and composition as they differentiate and become filled with keratin. After reaching the top layer stratum corneum they are eventually 'sloughed off', or desquamated. This process is called keratinization and takes place within weeks.

It was previously believed that the stratum corneum was "a simple, biologically inactive, outer epidermal layer comprising a fibrillar lattice of dead keratin". It is now understood that this is not true, and that the stratum corneum should be considered to be a live tissue. While it is true that the stratum corneum is mainly composed of terminally differentiated keratinocytes called corneocytes that are anucleated, these cells remain alive and metabolically functional until desquamated.[citation needed ]

The epidermis is divided into the following 5 sublayers or strata:

Blood capillaries are found beneath the epidermis and are linked to an arteriole and a venule. Arterial shunt vessels may bypass the network in ears, the nose and fingertips.

About 70% of all human protein-coding genes are expressed in the skin. Almost 500 genes have an elevated pattern of expression in the skin. There are less than 100 genes that are specific for the skin, and these are expressed in the epidermis. An analysis of the corresponding proteins show that these are mainly expressed in keratinocytes and have functions related to squamous differentiation and cornification.

The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbours many nerve endings that provide the sense of touch and heat. It contains the hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels. The blood vessels in the dermis provide nourishment and waste removal from its own cells as well as from the stratum basale of the epidermis.

The dermis is structurally divided into two areas: a superficial area adjacent to the epidermis, called the papillary region, and a deep thicker area known as the reticular region.

The papillary region is composed of loose areolar connective tissue. It is named for its finger-like projections called papillae, which extend toward the epidermis. The papillae provide the dermis with a "bumpy" surface that interdigitates with the epidermis, strengthening the connection between the two layers of skin.

In the palms, fingers, soles, and toes, the influence of the papillae projecting into the epidermis forms contours in the skin's surface. These epidermal ridges occur in patterns ( see: fingerprint) that are genetically and epigenetically determined and are therefore unique to the individual, making it possible to use fingerprints or footprints as a means of identification.

The reticular region lies deep in the papillary region and is usually much thicker. It is composed of dense irregular connective tissue, and receives its name from the dense concentration of collagenous, elastic, and reticular fibres that weave throughout it. These protein fibres give the dermis its properties of strength, extensibility, and elasticity.

Also located within the reticular region are the roots of the hairs, sebaceous glands, sweat glands, receptors, nails, and blood vessels.

Tattoo ink is held in the dermis. Stretch marks, often from pregnancy and obesity, are also located in the dermis.

The subcutaneous tissue (also hypodermis and subcutis) is not part of the skin, but lies below the dermis of the cutis. Its purpose is to attach the skin to underlying bone and muscle as well as supplying it with blood vessels and nerves. It consists of loose connective tissue, adipose tissue and elastin. The main cell types are fibroblasts, macrophages and adipocytes (subcutaneous tissue contains 50% of body fat). Fat serves as padding and insulation for the body.

Human skin shows high skin colour variety from the darkest brown to the lightest pinkish-white hues. Human skin shows higher variation in colour than any other single mammalian species and is the result of natural selection. Skin pigmentation in humans evolved to primarily regulate the amount of ultraviolet radiation (UVR) penetrating the skin, controlling its biochemical effects.

The actual skin colour of different humans is affected by many substances, although the single most important substance determining human skin colour is the pigment melanin. Melanin is produced within the skin in cells called melanocytes and it is the main determinant of the skin colour of darker-skinned humans. The skin colour of people with light skin is determined mainly by the bluish-white connective tissue under the dermis and by the haemoglobin circulating in the veins of the dermis. The red colour underlying the skin becomes more visible, especially in the face, when, as consequence of physical exercise or the stimulation of the nervous system (anger, fear), arterioles dilate.

There are at least five different pigments that determine the colour of the skin. These pigments are present at different levels and places.

Melanin: It is brown in colour and present in the basal layer of the epidermis.

Melanoid: It resembles melanin but is present diffusely throughout the epidermis.

Carotene: This pigment is yellow to orange in colour. It is present in the stratum corneum and fat cells of dermis and superficial fascia.

Hemoglobin (also spelled haemoglobin): It is found in blood and is not a pigment of the skin but develops a purple colour.

Oxyhemoglobin: It is also found in blood and is not a pigment of the skin. It develops a red colour.

There is a correlation between the geographic distribution of UV radiation (UVR) and the distribution of indigenous skin pigmentation around the world. Areas that highlight higher amounts of UVR reflect darker-skinned populations, generally located nearer towards the equator. Areas that are far from the tropics and closer to the poles have lower concentration of UVR, which is reflected in lighter-skinned populations.

In the same population it has been observed that adult human females are considerably lighter in skin pigmentation than males. Females need more calcium during pregnancy and lactation, and vitamin D which is synthesized from sunlight helps in absorbing calcium. For this reason it is thought that females may have evolved to have lighter skin in order to help their bodies absorb more calcium.

The Fitzpatrick scale is a numerical classification schema for human skin colour developed in 1975 as a way to classify the typical response of different types of skin to ultraviolet (UV) light:

As skin ages, it becomes thinner and more easily damaged. Intensifying this effect is the decreasing ability of skin to heal itself as a person ages.

Among other things, skin ageing is noted by a decrease in volume and elasticity. There are many internal and external causes to skin ageing. For example, ageing skin receives less blood flow and lower glandular activity.

A validated comprehensive grading scale has categorized the clinical findings of skin ageing as laxity (sagging), rhytids (wrinkles), and the various facets of photoageing, including erythema (redness), and telangiectasia, dyspigmentation (brown discolouration), solar elastosis (yellowing), keratoses (abnormal growths) and poor texture.

Cortisol causes degradation of collagen, accelerating skin ageing.

Anti-ageing supplements are used to treat skin ageing.[citation needed ]

Photoageing has two main concerns: an increased risk for skin cancer and the appearance of damaged skin. In younger skin, sun damage will heal faster since the cells in the epidermis have a faster turnover rate, while in the older population the skin becomes thinner and the epidermis turnover rate for cell repair is lower, which may result in the dermis layer being damaged.

Skin performs the following functions:

1. Protection: an anatomical barrier from pathogens and damage between the internal and external environment in bodily defence; Langerhans cells in the skin are part of the adaptive immune system. Perspiration contains lysozyme that break the bonds within the cell walls of bacteria.

2. : contains a variety of nerve endings that react to heat and cold, touch, pressure, vibration, and tissue injury; see somatosensory system and haptics.

3. Heat regulation: the skin contains a blood supply far greater than its requirements which allows precise control of energy loss by radiation, convection and conduction. Dilated blood vessels increase perfusion and heat loss, while constricted vessels greatly reduce cutaneous blood flow and conserve heat.

4. Control of evaporation: the skin provides a relatively dry and semi-impermeable barrier to fluid loss. Loss of this function contributes to the massive fluid loss in burns.

5. Aesthetics and communication: others see our skin and can assess our mood, physical state and attractiveness.

6. Storage and synthesis: acts as a storage centre for lipids and water, as well as a means of synthesis of vitamin D by action of UV on certain parts of the skin.

7. Excretion: sweat contains urea, however its concentration is 1/130th that of urine, hence excretion by sweating is at most a secondary function to temperature regulation.

8. Absorption: the cells comprising the outermost 0.25-0.40 mm of the skin are "almost exclusively supplied by external oxygen", although the "contribution to total respiration is negligible". In addition, medicine can be administered through the skin, by ointments or by means of adhesive patch, such as the nicotine patch or iontophoresis. The skin is an important site of transport in many other organisms.

9. Water resistance: The skin acts as a water-resistant barrier so essential nutrients are not washed out of the body.

The human skin is a rich environment for microbes. Around 1000 species of bacteria from 19 bacterial phyla have been found. Most come from only four phyla: Actinobacteria (51.8%), Firmicutes (24.4%), Proteobacteria (16.5%), and Bacteroidetes (6.3%). Propionibacteria and Staphylococci species were the main species in sebaceous areas. There are three main ecological areas: moist, dry and sebaceous. In moist places on the body Corynebacteria together with Staphylococci dominate. In dry areas, there is a mixture of species but dominated by b- Proteobacteria and Flavobacteriales. Ecologically, sebaceous areas had greater species richness than moist and dry ones. The areas with least similarity between people in species were the spaces between fingers, the spaces between toes, axillae, and umbilical cord stump. Most similarly were beside the nostril, nares (inside the nostril), and on the back.

Reflecting upon the diversity of the human skin researchers on the human skin microbiome have observed: "hairy, moist underarms lie a short distance from smooth dry forearms, but these two niches are likely as ecologically dissimilar as rainforests are to deserts."

The NIH conducted the Human Microbiome Project to characterize the human microbiota which includes that on the skin and the role of this microbiome in health and disease.

Microorganisms like Staphylococcus epidermidis colonize the skin surface. The density of skin flora depends on region of the skin. The disinfected skin surface gets recolonized from bacteria residing in the deeper areas of the hair follicle, gut and urogenital openings.

Diseases of the skin include skin infections and skin neoplasms (including skin cancer). Dermatology is the branch of medicine that deals with conditions of the skin.

The skin is also valuable for diagnosis of other conditions, since many medical signs show through the skin. Skin color affects the visibility of these signs, a source of misdiagnosis in unaware medical personnel.

The skin supports its own ecosystems of microorganisms, including yeasts and bacteria, which cannot be removed by any amount of cleaning. Estimates place the number of individual bacteria on the surface of 6.5 square centimetres (1 sq in) of human skin at 50 million, though this figure varies greatly over the average 1.9 square metres (20 sq ft) of human skin. Oily surfaces, such as the face, may contain over 78 million bacteria per square centimetre (500 million per square inch). Despite these vast quantities, all of the bacteria found on the skin's surface would fit into a volume the size of a pea. In general, the microorganisms keep one another in check and are part of a healthy skin. When the balance is disturbed, there may be an overgrowth and infection, such as when antibiotics kill microbes, resulting in an overgrowth of yeast. The skin is continuous with the inner epithelial lining of the body at the orifices, each of which supports its own complement of microbes.

Cosmetics should be used carefully on the skin because these may cause allergic reactions. Each season requires suitable clothing in order to facilitate the evaporation of the sweat. Sunlight, water and air play an important role in keeping the skin healthy.

Oily skin is caused by over-active sebaceous glands, that produce a substance called sebum, a naturally healthy skin lubricant. A high glycemic-index diet and dairy products (except for cheese) consumption increase IGF-1 generation which in turn increases sebum production. Overwashing the skin does not cause sebum overproduction but may cause dryness.

When the skin produces excessive sebum, it becomes heavy and thick in texture. Oily skin is typified by shininess, blemishes and pimples. The oily-skin type is not necessarily bad, since such skin is less prone to wrinkling, or other signs of ageing, because the oil helps to keep needed moisture locked into the epidermis (outermost layer of skin).

The negative aspect of the oily-skin type is that oily complexions are especially susceptible to clogged pores, blackheads, and buildup of dead skin cells on the surface of the skin. Oily skin can be sallow and rough in texture and tends to have large, clearly visible pores everywhere, except around the eyes and neck.

Human skin has a low permeability; that is, most foreign substances are unable to penetrate and diffuse through the skin. Skin's outermost layer, the stratum corneum, is an effective barrier to most inorganic nanosized particles. This protects the body from external particles such as toxins by not allowing them to come into contact with internal tissues. However, in some cases it is desirable to allow particles entry to the body through the skin. Potential medical applications of such particle transfer has prompted developments in nanomedicine and biology to increase skin permeability. One application of transcutaneous particle delivery could be to locate and treat cancer. Nanomedical researchers seek to target the epidermis and other layers of active cell division where nanoparticles can interact directly with cells that have lost their growth-control mechanisms ( cancer cells). Such direct interaction could be used to more accurately diagnose properties of specific tumours or to treat them by delivering drugs with cellular specificity.

Nanoparticles 40 nm in diameter and smaller have been successful in penetrating the skin. Research confirms that nanoparticles larger than 40 nm do not penetrate the skin past the stratum corneum. Most particles that do penetrate will diffuse through skin cells, but some will travel down hair follicles and reach the dermis layer.

The permeability of skin relative to different shapes of nanoparticles has also been studied. Research has shown that spherical particles have a better ability to penetrate the skin compared to oblong (ellipsoidal) particles because spheres are symmetric in all three spatial dimensions. One study compared the two shapes and recorded data that showed spherical particles located deep in the epidermis and dermis whereas ellipsoidal particles were mainly found in the stratum corneum and epidermal layers. Nanorods are used in experiments because of their unique fluorescent properties but have shown mediocre penetration.

Nanoparticles of different materials have shown skin's permeability limitations. In many experiments, gold nanoparticles 40 nm in diameter or smaller are used and have shown to penetrate to the epidermis. Titanium oxide (TiO2), zinc oxide (ZnO), and silver nanoparticles are ineffective in penetrating the skin past the stratum corneum. Cadmium selenide (CdSe) quantum dots have proven to penetrate very effectively when they have certain properties. Because CdSe is toxic to living organisms, the particle must be covered in a surface group. An experiment comparing the permeability of quantum dots coated in polyethylene glycol (PEG), PEG- amine, and carboxylic acid concluded the PEG and PEG-amine surface groups allowed for the greatest penetration of particles. The carboxylic acid coated particles did not penetrate past the stratum corneum.

Scientists previously believed that the skin was an effective barrier to inorganic particles. Damage from mechanical stressors was believed to be the only way to increase its permeability.

Recently, simpler and more effective methods for increasing skin permeability have been developed. Ultraviolet radiation (UVR) slightly damages the surface of skin and causes a time-dependent defect allowing easier penetration of nanoparticles. The UVR's high energy causes a restructuring of cells, weakening the boundary between the stratum corneum and the epidermal layer. The damage of the skin is typically measured by the transepidermal water loss (TEWL), though it may take 3-5 days for the TEWL to reach its peak value. When the TEWL reaches its highest value, the maximum density of nanoparticles is able to permeate the skin. While the effect of increased permeability after UVR exposure can lead to an increase in the number of particles that permeate the skin, the specific permeability of skin after UVR exposure relative to particles of different sizes and materials has not been determined.

There are other methods to increase nanoparticle penetration by skin damage: tape stripping is the process in which tape is applied to skin then lifted to remove the top layer of skin; skin abrasion is done by shaving the top 5-10 μm off the surface of the skin; chemical enhancement applies chemicals such as polyvinylpyrrolidone (PVP), dimethyl sulfoxide (DMSO), and oleic acid to the surface of the skin to increase permeability; electroporation increases skin permeability by the application of short pulses of electric fields. The pulses are high voltage and on the order of milliseconds when applied. Charged molecules penetrate the skin more frequently than neutral molecules after the skin has been exposed to electric field pulses. Results have shown molecules on the order of 100 μm to easily permeate electroporated skin.

A large area of interest in nanomedicine is the transdermal patch because of the possibility of a painless application of therapeutic agents with very few side effects. Transdermal patches have been limited to administer a small number of drugs, such as nicotine, because of the limitations in permeability of the skin. Development of techniques that increase skin permeability has led to more drugs that can be applied via transdermal patches and more options for patients.

Increasing the permeability of skin allows nanoparticles to penetrate and target cancer cells. Nanoparticles along with multi-modal imaging techniques have been used as a way to diagnose cancer non-invasively. Skin with high permeability allowed quantum dots with an antibody attached to the surface for active targeting to successfully penetrate and identify cancerous tumours in mice. Tumour targeting is beneficial because the particles can be excited using fluorescence microscopy and emit light energy and heat that will destroy cancer cells.

Sunblock and sunscreen are different important skin-care products though both offer full protection from the sun.

Sunblock- Sunblock is opaque and stronger than sunscreen, since it is able to block most of the UVA/UVB rays and radiation from the sun, and does not need to be reapplied several times in a day. Titanium dioxide and zinc oxide are two of the important ingredients in sunblock.

Sunscreen- Sunscreen is more transparent once applied to the skin and also has the ability to protect against UVA/UVB rays, although the sunscreen's ingredients have the ability to break down at a faster rate once exposed to sunlight, and some of the radiation is able to penetrate to the skin. In order for sunscreen to be more effective it is necessary to consistently reapply and use one with a higher sun protection factor.

Vitamin A, also known as retinoids, benefits the skin by normalizing keratinization, downregulating sebum production which contributes to acne, and reversing and treating photodamage, striae, and cellulite.

Vitamin D and analogues are used to downregulate the cutaneous immune system and epithelial proliferation while promoting differentiation.

Vitamin C is an antioxidant that regulates collagen synthesis, forms barrier lipids, regenerates vitamin E, and provides photoprotection.

Vitamin E is a membrane antioxidant that protects against oxidative damage and also provides protection against harmful UV rays.

Several scientific studies confirmed that changes in baseline nutritional status affects skin condition.

The Mayo Clinic lists foods they state help the skin: fruits and vegetables, whole-grains, dark leafy greens, nuts, and seeds.

1. ^ "Skin care" (analysis), Health-Cares.net, 2007, webpage: HCcare Archived 12 December 2007 at the Wayback Machine

2. ^ Herron AJ (5 December 2009). "Pigs as Dermatologic Models of Human Skin Disease" (PDF). ivis.org. DVM Center for Comparative Medicine and Department of Pathology Baylor College of Medicine Houston, Texas. pig skin has been shown to be the most similar to human skin. Pig skin is structurally similar to human epidermal thickness and dermal-epidermal thickness ratios. Pigs and humans have similar hair follicle and blood vessel patterns in the skin. Biochemically pigs contain dermal collagen and elastic content that is more similar to humans than other laboratory animals. Finally pigs have similar physical and molecular responses to various growth factors.

3. ^ Liu J, Kim D, Brown L, Madsen T, Bouchard GF. "Comparison of Human, Porcine and Rodent Wound Healing With New Miniature Swine Study Data" (PDF). sinclairresearch.com. Sinclair Research Centre, Auxvasse, MO, USA; Veterinary Medical Diagnostic Laboratory, Columbia, MO, USA. Pig skin is anatomically, physiologically, biochemically and immunologically similar to human skin

4. Marks, James G; Miller, Jeffery (2006). Lookingbill and Marks' Principles of Dermatology. (4th ed.). Elsevier Inc. ISBN 1-4160-3185-5.

5. Pappas S. (2009). Your Body Is a Wonderland ... of Bacteria. ScienceNOW Daily News Archived 2 June 2009 at the Wayback Machine

6. ^ Maton A, Hopkins J, McLaughlin CW, Johnson S, Warner MQ, LaHart D, Wright JD (1893). Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall. ISBN 978-0-13-981176-0.

7. Wilkinson PF, Millington R (2009). Skin (Digitally printed version ed.). Cambridge: Cambridge University Press. pp. 49-50. ISBN 978-0-521-10681-8.

8. ^ Del Rosso JQ, Levin J (September 2011). "The clinical relevance of maintaining the functional integrity of the stratum corneum in both healthy and disease-affected skin". The Journal of Clinical and Aesthetic Dermatology. 4 (9): 22-42. doi:10.1111/j.1365-2133.1990.tb06268.x. PMC . PMID 21938268.

9. ^ Kligman A (2006). "A brief history of how the dead stratum corneum became alive". Skin Barrier. New York: Taylor & Francis. pp. 35-44. ISBN 9780429163470.

10. ^ Edqvist PH, Fagerberg L, Hallström BM, Danielsson A, Edlund K, Uhlén M, Pontén F (February 2015). "Expression of human skin-specific genes defined by transcriptomics and antibody-based profiling". The Journal of Histochemistry and Cytochemistry. 63 (2): 129-41. doi:10.1369/0022155414562646. PMC . PMID 25411189.

11. ^ Muehlenbein M (2010). Human Evolutionary Biology. Cambridge University Press. pp. 192-213. ISBN 978-1139789004.

12. ^ "Fitzpatrick Skin Type" (PDF). Australian Radiation Protection and Nuclear Safety Agency. Archived from the original (PDF) on 31 March 2016.

13. Alexiades-Armenakas, M. R., et al. The spectrum of laser skin resurfacing: nonablative, fractional, and ablative laser resurfacing. ^ J Am Acad Dermatol. 2008 May;58(5):719-37; quiz 738-40

14. Ryman-Rasmussen, J.P., Riviere, J.E. and Monteiro-Riviere, N.A. Penetration of Intact Skin by Quantum Dots with Diverse Physicochemical Properties. Toxicological Sciences 2006;91(1):159-165

15. ^ Sokolov K, Follen M, Aaron J, Pavlova I, Malpica A, Lotan R, Richards-Kortum R (May 2003). "Real-time vital optical imaging of precancer using anti-epidermal growth factor receptor antibodies conjugated to gold nanoparticles". Cancer Research. 63 (9): 1999-2004. PMID 12727808.

16. ^ An update on Suncreens; 2007; P 23- 29. Available at www.aocd.org/resource/resmgr/jaocd/2007aug.pdf

17. ^ "Nanotechnology Information Center: Properties, Applications, Research, and Safety Guidelines". American Elements.

# data[].attributes.attachment_link.description
The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue and guards the underlying muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals' skin, and it is very similar to pig skin.

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Be still, my fluttering heart! Or rather--don’t. A movie on how this major muscle is always beating, helping blood to circulate through your whole body.

# data[].attributes.headline
Go look at the humman skin!!! what weres the link???!! 😔 you know the rutean... look 👎👎👎👎👎👎👎👎👎👎👎👎

# data[].attributes.subject
Go look at the humman skin!!! what weres the link???!! 😔 you know the rutean... look 👎👎👎👎👎👎👎👎👎👎👎👎

# data[].attributes.body
https://www.brainpop.com/health/bodysystems/skin/

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The human body is an amazing machine. Learn more about it through movies, quizzes, articles, and more.

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Human Body for Kids/Brain Song/Human Body Systems

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get trolled son!!! well eneyways, here is the dafen! The skeleton is the body part that forms the supporting structure of an organism. There are several different skeletal types: the exoskeleton, which is the stable outer shell of an organism, the endoskeleton, which forms the support structure inside the body, the hydroskeleton, and the cytoskeleton. The term comes from Greek ... And Skeleton is a winter sliding sport in which a person rides a small sled, known as a skeleton bobsled (or -sleigh), down a frozen track while lying face down and head-first. The sport and the sled may have been named from the bony appearance of the sled. Unlike other sliding sports of bobsleigh and luge, the race ...ELEPSES... heres were I got it from! 1st link {[(so I dont get copyrighted)]} https://en.wikipedia.org/wiki/Skeleton the 2end link : Skeleton (sport) - Wikipedia

https://en.wikipedia.org/wiki/Skeleton_(sport)

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Human Body for Kids/Skin Anatomy Song/Human Body Systems

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The Human Body for Kids/Learn about the Human Body for Children/Liver

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Large Intestine Song for Kids/Large Intestine for Children/Large Intestine Song

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mus·cle

ˈməsəl/

noun

plural noun: muscles

1. 1.

2. a band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body.

1. "the calf muscle"

2. 2.

3. physical power; strength.

1. "he had muscle but no brains"

2. synonyms: | strength, power, muscularity, brawn, burliness; More

|

verbinformal

3rd person present: muscles

1. 1.

2. NORTH AMERICAN

3. move (an object) in a particular direction by using one's physical strength.

1. "they were muscling baggage into the hold of the plane"

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This video will help you understand parts of the brain and how it works

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Are People Really Left-Brained or Right-Brained?

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The small intestine absorbs NUTRIENTS.

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The large intestine absorbs WATER.

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Interesting The Pancreas Facts: The pancreas releases hormones into the blood which help control your blood sugars (glucose). These two important chemicals are called insulin and glucagon. Insulin is released after you eat, or you have too much sugar(glucose) in your blood.

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The longest bone in the human body is the thigh bone called the femur.

The smallest bone found in the human body is located in the middle ear. ...

Like our skin, the human body's bones are also constantly worn down and re-made, to the point where every 7 years we essentially have a new bone.

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Muscles make up 40% of your total body weight. ...

Muscles make up 40% of your total body weight. ...

It takes half as long to gain muscle than it does to lose it. ...

It takes half as long to gain muscle than it does to lose it. ...

The smallest muscles are found in the middle ear. ...

The smallest muscles are found in the middle ear.

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The liver also detoxifies chemicals and metabolizes 🤬. As it does so, the liver secretes bile that ends up back in the intestines. The liver also makes proteins important for blood plasma and other functions. With some expert support, here are 12facts about this underappreciated, hardworking organ.

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Your stomach, which is attached to your mouth by a long tube called the esophagus, is the first place your food starts to get broken down into molecules your body can use, which is a process called digestion. The stomach also has an important role in the immune system, which helps fight of infections.

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Here are some bizarre and interesting breathing facts!

The average person breathes in the equivalent of 13 pints of air every minute.

Children laugh about 300 times a day. ...

The lungs are the only organs in the human body to float on water.

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10. Your heart is one giant pump. Every minute, yourheart pumps about five quarts of blood through a system of blood vessels that's over 60,000 miles long, according to the Cleveland Clinic. That translates to about 2,000 gallons of blood every day.

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Babies Lose Half their Neurons at Birth. It is estimated that a baby loses about half their neurons before they are born. ...

Baby Talk Increases Vocabulary. ...

Birdsong Similar to Human Speech. ...

Blind Spot In Eye. ...

Brain Measurements Are Revealing. ...

Brain Uses 20% of Blood. ...

Brain Uses 20% of Oxygen Breathed. ...

Child Brain Development.

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Here are some of the most interesting facts about your skin:

The average person's skin covers an area of 2 square meters.

Skin accounts for about 15% of your body weight.

The average adult has approximately 21 square feet of skin, which weighs 9 lbs and contains more than 11 miles of blood vessels.

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Circulatory System. (heart, blood, vessels)

Respiratory System. (nose, trachea, lungs)

Immune System. (many types of protein, cells, organs, tissues)

Skeletal System. (bones)

Excretory System. (lungs, large intestine, kidneys)

Urinary System. ...

Muscular System. ...

Endocrine System.

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Humans have five vital organs that are essential for survival. These are the brain, heart, kidneys, liver and lungs. The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones.

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Vital organs. Humans have five vital organs that areessential for survival. These are the brain, heart, kidneys, liver and lungs. The human brain is the body'scontrol center, receiving and sending signals to otherorgans through the nervous system and through secreted hormones.

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The small intestine function is to break down nutrients for the body.The small intestine is made up of 4 layers.The mucosa forms the inner layer of epithelial tissue and is specialized for the absorption of nutrientsfrom chyme. Their chemical breakdown begins in the stomach and continues through the large intestine. Proteolytic enzymes, including trypsin and chymotrypsin, are secreted by the pancreas and cleave proteins into smaller peptides. Carboxypeptidase, a pancreatic brush border enzyme, splits one amino acid at a time.The enzymes that act inside the small intestine are amylase, protease, and lipase.Amylase acts on starch and breaks it down into small carbohydrate molecules.Protease acts on proteins and breaks them down into amino acids. Lipase breaks down dietary fats into smaller molecules called fatty acids and glycerol.

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The large intestine function is to absorb water from the remaining indigestible food matter and transmit the useless waste material from the body.The enzymes that act inside the small intestine are amylase, protease, and lipase.Amylase acts on starch and breaks it down into small carbohydrate molecules.Protease acts on proteins and breaks them down into amino acids. Lipase breaks down dietary fats into smaller molecules called fatty acids and glycerol.

The ascending colon including the cecum and appendix.

The transverse colon including the colic flexures and transverse mesocolon.

The descending colon.

The sigmoid colon – the s-shaped region of the large intestine.

The large intestine has three main parts. First is a pouch called the cecum. (The cecum is home to the appendix, the small fingerlike pouch that can become inflamed and extremely painful in some people.) Next comes the colon, which hasthree sections: ascending, transverse and descending.The large intestine has three main parts. First is a pouch called the cecum. (The cecum is home to the appendix, the small fingerlike pouch that can become inflamed and extremely painful in some people.) Next comes the colon, which has three sections: ascending, transverse and descending.These intestinal walls also absorb vitamins released from the fermentation of feces by bacteria living in the large intestine. Our large intestine consists of 4 major regions: the cecum, colon, 🤬, and 🤬 canal. The cecum is a pouch-like dead-end passage that branches inferiorly from the end of the ileum.