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A Day In The Life Of An Anxious High Schooler by Cece Benz

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This is what a day in the life of an anxious body hating teen is like. This day stems from both experiences and stories.

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Human Body Systems Lesson (Grades 3-5) | Circulatory, Digestive & Respiratory

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Do you know how human body systems work and interact? Watch this fun science lesson on the different human body systems for kids in 3rd, 4th and 5th grade!

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Introduction
The human body is a combination of parts and systems that work together to perform the necessary functions of life. The body is composed of cells and extracellular materials that are organized into tissues, organs, and organ systems. Many scientists divide the body into 11 separate organ systems: muscular, skeletal, circulatory, respiratory, digestive, urinary, endocrine, nervous, integumentary, reproductive, and immune.

The parts and systems of the human body are discussed in detail in many different articles. The article human anatomy describes the structure of the human body and provides an overview of each of its major body systems. For details on the individual body systems, see cardiovascular system; digestive system; immune system; endocrine system; nervous system; skeleton; urinary system; reproductive system; and lymphatic system.

The changes in the body over time-how it develops, matures, and ages-are discussed in the articles pregnancy and birth; embryology; menstruation; adolescence; growth; and aging.

Basic Form and Characteristics
Humans are animals-more specifically, they are mammals. As such, they share certain basic characteristics with all mammals. The human body is covered with skin which in turn is covered with hair. Humans are endothermic, or warm-blooded, meaning that their body temperature remains relatively constant regardless of environmental temperature. Like most mammals, human females give birth to fully developed offspring. Females have mammary glands that produce milk, which they feed to their babies.

Like all mammals, humans are vertebrates, or animals that have a backbone. As is typical of all vertebrates, the human body displays bilateral symmetry. This means it has two mirror-image sides-a right side and a left side. It has distinct upper and lower surfaces and a distinct front and rear. As vertebrates, humans are further characterized as tetrapods, meaning they have four limbs-two arms and two legs. Humans are bipedal-this means they stand upright and walk, or locomote, on two limbs (the legs).

The human body is structured as a hierarchy of increasingly complex levels. The most basic unit in the hierarchy is the cell. Groups of similar cells form tissues. Groups of different tissues make up organs. Groups of organs are integrated into organ systems. Together, cells, tissues, organs, and organ systems form a multicellular organism.

Composition of the Body
The human body is composed of water, minerals, and organic compounds (mainly proteins, lipids, carbohydrates, and nucleic acids). Water composes up to 60 percent of the body. It is found outside of cells in body fluids, such as blood and lymph, and in the spaces between tissues. Water also is found inside the cells, where it plays a key role in cellular processes and chemical reactions essential to life.

Proteins are part of the body's structure. They are found in all cell membranes. Hair and nails are composed of proteins, as are the elastic fibrous tissues in skin, bone, tendons, and ligaments. Some proteins play important functional roles in the processes of life. Enzymes and hormones are two classes of functional proteins.

Like proteins, lipids are a major structural component of the body. Lipids include fats, phospholipids, and steroids such as cholesterol. Fats are stored as energy for the body and also serve as insulation. Cell membranes are rich in phospholipids and cholesterol. Some hormones, such as estrogen and aldosterone, are composed largely of steroid compounds.

The main role of carbohydrates in the human body is as a source of fuel. Glucose is perhaps the most important carbohydrate in humans, and indeed in all mammals. It provides the energy needed for life processes such as cellular respiration. Also important is glycogen, a complex form of glucose that is stored in the liver and the muscles.

Nucleic acids are found in the genetic materials of the body. Deoxyribonucleic acid ( DNA) carries the body's genetic code. Ribonucleic acid (RNA) carries out the instructions encoded in DNA.

Calcium, phosphorus, sodium, magnesium, and iron are the main inorganic minerals found in the body. Some of these minerals play key roles in the body's metabolic processes. Calcium and phosphorus are found largely in the body's bones. Iron is an important part of hemoglobin, the protein in red blood cells responsible for transporting oxygen.

Body System Interactions
The human body contains 11 major organ systems: immune, digestive, endocrine, nervous, urinary, cardiovascular, lymphatic, respiratory, integumentary (skin), muscular, and skeletal. Each system includes one or more organs or structures that work together to maintain a given function. For example, the urinary system consists mainly of the kidneys, bladder, ureters, and urethra, all of which work together to remove wastes and excess water from the body.

However, though groups of organs are classified into different body systems, these systems do not work in isolation. Although each system has a primary role, all the systems work together to keep the body healthy and maintain balance, or homeostasis.

Some body systems work together to achieve a particular goal. The nervous system and endocrine system work together to control almost all of the body's processes. The respiratory system and cardiovascular system work together to provide the body with oxygen and to rid the body of carbon dioxide. Other systems share a common organ that performs multiple tasks. For example, the pancreas serves both the digestive system and the endocrine system.

A disorder in one system can cause other systems to malfunction. For example, the cardiovascular system transports oxygen and nutrients to the tissues and removes carbon dioxide and other wastes. The kidneys work with the cardiovascular system by filtering wastes from the blood; they also remove excess water and regulate salt levels. The "clean" blood returns to the heart and the wastes and excess water are excreted in urine. If the kidneys become damaged, wastes and excess water will build up in the blood. This can damage the heart and blood vessels, making it harder for them to supply nutrients and remove wastes. This can further damage the kidneys and can cause multiple organs to malfunction.

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The human body is a combination of parts and systems that work together to perform the necessary functions of life. The body is composed of cells and extracellular materials...

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Welcome to CK-12 Foundation | CK-12 Foundation

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Store photos and docs online. Access them from any PC, Mac or phone. Create and work together on Word, Excel or PowerPoint documents.

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Eating, travelling, heating your home... What's the carbon footprint of these activities and how can we make more climate-friendly choices?
When you drive your car, buy a pair of sneakers or grill a steak, you contribute to the emission of carbon dioxide and other greenhouse gases into the atmosphere. It's your carbon footprint. Many countries, institutions and companies have committed to reduce their emissions while the EU has even set the objective of being "climate neutral" by 2050. As an individual, you can also estimate your carbon footprint and reduce it. Discover how.

What is a carbon footprint?

Greenhouse gases are emitted through the production and consumption of goods and services. Carbon footprint is a concept used to quantify the impact of an activity, a person or a country on climate change.

How much carbon is emitted to produce your t-shirt, meal or phone? The amount will depend on production and consumption choices. If we take the example of transport, taking the plane emits 285g of carbon per kilometre, compared to 104g for a car and 14g for a train. The same goes for the type of meat or fish you eat or the type of jeans you buy.

Why should you care?

The world's seven billion people consume varying amounts of the planet's resources. According to the United Nations' predictions, global population could reach 9.7 billion people by 2050, and over 11 billion by 2100. Growing populations drive up emissions and deplete the planet's resources.

Increased greenhouse gas emissions have a direct impact on global warming. It accelerates climate change with disastrous effects on our planet. All of us can contribute to fighting global warming by making climate-friendly choices in our daily lives.

How to limit your carbon footprint?

Understanding your carbon footprint can help limit the impact of your consumption on the environment. There are different online solutions to help you estimate your carbon footprint.

Small changes can make a big difference in the long run, for example when it comes to transportation, food, clothing, waste, etc. Here are some tips:
Food

Consume local and seasonal products (forget strawberries in winter)

Limit meat consumption, especially beef

Select fish from sustainable fishing

Bring reusable shopping bags and avoid products with excessive plastic packaging

Make sure to buy only what you need, to avoid waste

Clothing

Take good care of your clothes

Try swapping, borrowing, renting or buying second-hand

Buy responsibly-made clothes, e.g. made from recycled material or with an eco-label

Transport

Cycle or use public transport

Be smart about when and how you drive

Try the train for your next holiday

Energy and waste

Turn down the heating by 1°, it will already make a difference

Take short showers

Turn off the water while you brush your teeth or clean the dishes

Unplug your electronic equipment and don't leave your phone on charge when the battery is already full

Don't store unnecessary data in the cloud (learn more about your digital footprint!)

Select energy efficient products with an "A" label (EU Energy Label)

Limit and recycle your waste

Written by Eurodesk Brussels Link

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How to reduce my carbon footprint? | European Youth Portal

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Eating, travelling, heating your home... What's the carbon footprint of these activities and how can we make more climate-friendly choices?

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Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO ₂) is made up of one carbon atom and two oxygen atoms.

Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere. Without it, our planet would be inhospitably cold. However, a gradual increase in CO ₂ concentrations in Earth's atmosphere is helping to drive global warming, threatening to disrupt our planet's climate as average global temperatures gradually rise.

Carbon dioxide is the fourth most abundant component of dry air. It has a concentration of about 400 ppmv (parts per million by volume) in Earth's atmosphere. Scientists estimate that before human industrial activity, CO ₂ concentration was around 270 ppmv. Carbon dioxide levels in our atmosphere have thus risen about 40% since the onset of human industrialization, and are expected to play a troubling role in raising global temperature. Atmospheric carbon dioxide concentrations have varied substantially in the pre-human history of our planet, and have had profound impacts on global temperatures in the past.

Carbon dioxide plays a key role in Earth's carbon cycle, the set of processes that cycle carbon in many forms throughout our environment. Volcanic outgassing and wildfires are two significant natural sources of CO ₂ in Earth's atmosphere. Respiration, the process by which organisms liberate energy from food, emits carbon dioxide. When you exhale, it is carbon dioxide (amongst other gases) that you breathe out. Combustion, whether in the guise of wildfires, as a result of slash-and-burn agricultural practices, or in internal combustion engines, produces carbon dioxide.

Photosynthesis, the biochemical process by which plants and some microbes create food, uses up carbon dioxide. Photosynthetic organisms combine CO ₂ and water (H ₂O) to produce carbohydrates (such as sugars) and emit oxygen as a by-product. Places such as forests and areas of the ocean that support photosynthetic microbes, therefore, act as massive carbon "sinks", removing carbon dioxide from the atmosphere via photosynthesis. Earth's early atmosphere had much higher CO ₂ levels and almost no oxygen; the rise of photosynthetic organisms led to an increase in oxygen which enabled the development of oxygen-breathing creatures such as us!

Burning generates CO ₂, although incomplete combustion due to limited oxygen supply or an excess of carbon can also produce carbon monoxide (CO). Carbon monoxide, a dangerous pollutant, eventually oxidizes to carbon dioxide.

Small canisters containing pressurized CO ₂ are used to inflate bicycle tires and life jackets and to power paintball guns. The "fizz" in soda pop is supplied by carbon dioxide. Carbon dioxide is also released by yeast during fermentation, giving beer its head and making champagne bubbly. Because it is not flammable, CO ₂ is used in some fire extinguishers. Carbon dioxide forms a weak acid, called carbonic acid (H ₂CO ₃), when dissolved in water.

Carbon dioxide is the most abundant gas in the atmospheres of Mars and Venus. Solid, frozen carbon dioxide is called "dry ice". The polar ice caps of Mars are a mixture of normal water ice and dry ice. Liquid CO ₂ only forms at pressures higher than about 5 times the atmospheric pressure on Earth at sea level, so in many situations dry ice does not melt into a liquid form. Instead, it goes directly from a solid state to a gaseous state in a process called sublimation.

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Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air.

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