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The skeleton system consists of bones, cartilage, ligaments, and tendons, the skeleton system is a complex structure that keeps up with the body's organs, provides movement, and creates red blood cells. An adult have 206 spongy or compact bones, which can be classified as long, short, flat, or irregular. It also holds energy and minerals. The two different kinds of joints are fibrous, which is rigid, and synovial, which is mobile. The cells responsible for the system's ongoing rebuilding are called osteoblasts, osteoclasts, and osteoelasts.

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The muscular system is made up of three diffrent types of muscle tissue skeletal, cardiac, and smooth. Skeletal muscles allow voluntarily movement and posture, while the cardiac muscle make the heart beat. Smooth muscle controls involuntary organ functions. Muscle contraction is is made possible by connections among myosin and actin filaments, which facilitate mobility, stability, and production of heat.

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The nervous system controls the body's ability to respond to both internal and external stimuli by controlling bodily functions like movement, sensation, cognition, and autonomic processes like digestion and heart rate.

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The endocrine system's glands transmit hormones into the bloodstream that control a number of body processes, for example mood, growth, and metabolism. Major glands include the thyroid gland, the pituitary, and adrenal glands. It works in together with the nervous system to maintain the body's equilibrium and flexibility.

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The skin, hair, nails, and glands make up the integumentary system, which is the biggest organ system in the body. It controls body temperature, protects, assists in the senses. In addition, it makes vitamin D production and waste sweating easier. When all has been said and done, it helps to maintain balance and overall wellness.

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Function:

move nutrients, waste, CO2 and O2 through the body using the blood flow.

Structure:

Heart-> pumps blood-> cardiac muscle.

Blood vessels->Arteries->carry blood with O2.

Veins-> carry blood with CO2.

capillaries-> distribute O2 and nutrients collect wast and CO2.

->Blood->connective tissue.

-> red blood cell -> carry O2.

-> white blood cell-> defend against bacteria, viruses.

->platelets->help healing through colts.

-> plasma-> liquid portion.

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Food is processed by the digestive system by a number of organs, which begin in the mouth and stop in the anus. The stomach, small intestine which absorbs most nutrients and big intestine which compacts waste are important parts of the digestive system. Its functions include food breakdown, vitamin absorption, and waste removal. A functioning digestive system is necessary for general health.

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The excretory system removes waste and maintains fluid and electrolyte balance. It is mostly made up of the kidneys, ureters, bladder, and urethra. The kidneys remove extra materials into urine, filter blood, and take in essential substances. In order to preserve homeostasis and avoid the accumulation of hazardous substances, this mechanism is essential. Serious health problems including renal disease can be brought on by disorders.

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When the pathogens enter the body there are phisical and chemical barriers, as well as responses like coughing, tearing up, and producing mucus.

This is the first line of defense the second line of defense is the Nonspecific Immunity

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Immunity system refers to the group of organs, tissues and cells that protects the body against infections like bacteria, viruses and parasites. There are two main processes which work in this way. First, there is an increase to the immune response after a infection, in the case of the bone morrow cells against the pathogens of this infections that have been in your body before, the infection will be found faster for a better immune response, then there is the natural immunity, which the protection is already there using barriers and some immune systems but such response are rather non-specific and rapid. Also the immune system shows these immune responses to eliminate infections.

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Nervous and immune systems are connected since the nervous system can release neurotransmitters and neuropeptides that can affect the function of immune cells.

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Nervous system connected to the endocrine system with the help of the HPA. This means that when stress is perceived by the brain, the hypothalamus releases a signal that controls the production of the hormone ACTH from the pituitary gland. ACTH stimulates the adrenals to secrete Cortisol that helps to manage the stress situation and function optimal of other body systems too including the immune one, among many other things.

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The skeletal system helps with the mobility in our body by giving it a structure, that connects it to the muscular system. Tendons connect muscles to bones, and as muscles contract, they pull on the bones to help in movements like lifting, walking, and running.

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The skeletal system in connected with the circulatory system in important ways. The process of blood cell production, which produces red blood cells, white blood cells, and platelets, takes place in the bone marrow, which is inside the bones. Transporting oxygen, the defense against infections, and blood clotting depend on its production.

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The Nonspecific immunity is connected to the circulatory system to transport immune cells,These immune cells move through the veins in the course of an infection to respond quickly to the bacteria.

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The endocrine system is connected to the nonspecific immune system also by releasing hormones like cortisol, which is created during stress. Although long term high amounts of cortisol can decrease the immune function and increase risk to infections, cortisol helps regulate inflammation and immunity.

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The integumentary system protects the muscles underneath by working as a barrier against physical injuries, infections, and external factors. This barrier of protection is important in physical activity because the skin absorbs some of the impact and keeps dangerous materials from getting to the muscles.

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As the immune system's first line of defense against infections, the integumentary system is important. The skin acts as a physical barrier that keeps germs, viruses, and dangerous materials out of the body.

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The excretory system connects with the digestive system by helping to remove the waste produced during digestion and regulating fluid balance in the body. Waste products like undigested food and waste products from metabolism are produced by the digestive system as well as the breakdown of food and absorption of nutrients.