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The function of the digestive system is digestion andabsorption. Digestion is the breakdown of food into small molecules, which are then absorbed into the body. The digestive system is divided into two major parts: The digestive tract (alimentary canal) is a continuous tube with two openings: the mouth and the anus.

Gastroesophageal Reflux Disease (GERD) ...

Gallstones. ...

Celiac Disease. ...

Crohn's Disease. ...

Ulcerative Colitis. ...

Irritable Bowel Syndrome. ...

Hemorrhoids. ...

Diverticulitis.

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The immune system is made up of a network of cells, tissues, and organs that work together to protect thebody. One of the important cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.Complications arise when the immune system does not function properly. Some issues are less pervasive, such as pollen allergy, while others are extensive, such as genetic disorders that wipe out the presence or function of an entire set of immune cells.

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Functionally, the nervous system has two main subdivisions: the somatic, or voluntary, component; and the autonomic, or involuntary, component. The autonomic nervous system regulates certain body processes, such as blood pressure and the rate of breathing, that work without conscious effort, according to Merck Manuals. The somatic system consists of nerves that connect the brain and spinal cord with muscles and sensory receptors in the skin.Brain and nervous system problems are common. These neurological disorders include multiple sclerosis, Alzheimer's disease, Parkinson's disease, epilepsy, and stroke, and can affect memory and ability to perform daily activities.

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The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the bodythat regulate the activity of cells or organs. These hormonesregulate the body's growth, metabolism (the physical and chemical processes of the body), and sexual development and function.

Growth and developmentMetabolism - digestion, elimination, breathing, blood circulation and maintaining body temperature

Sexual function

Reproduction

Mood

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The circulatory system is made up of the heart, blood and blood vessels known as arteries, capillaries and veins. The heart pumps blood throughout your body through the blood vessels. Blood delivers oxygen and nutrients to cells and carries away carbon dioxide and other waste materials.

Atherosclerosis– Literally, “hardening of the fatty stuff.” High fat diets can lead to formation of fatty plaques lining blood vessels. These fatty areas can become calcified and hard leading to arteriosclerosis, hardening of the arteries. When blood vessels become less stretchable, blood pressure rises and can result in heart and kidney damage and strokes.

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The function of the human respiratory system is totransport air into the lungs and to facilitate the diffusion of Oxygen into the blood stream. Its also receives waste Carbon Dioxide from the blood and exhales it.Diseases and conditions of the respiratory system fall into two categories: viruses, such as influenza, bacterialpneumonia, enterovirus respiratory virus; and chronic diseases, such as asthma and chronic obstructive pulmonary disease (COPD).

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The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature.Diseases of the integumentary system. Dermatologists specialize in treating diseases, disorders and injuries of theskin, hair and nails. They treat common conditions such asacne and warts; chronic skin conditions such as eczema andpsoriasis; and more serious diseases like skin cancer, according to the AAD.

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The main fuction of the muscular system is movement. Muscles ar the pnly tissues in the body that has the ability to contract and therefore move the other parts of the body. Related to the function related to the function of movement is the muscular system secound function: the maintenance of posture and body position.

Injury or overuse, such as sprains or strains, cramps or tendinitis

A genetic disorder, such as muscular dystrophy

Some cancers

Inflammation, such as myositis

Diseases of nerves that affect muscles

Infections

Certain medicines

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The Skeletal System is the body system composed of bones and cartilage and performs the following critical functions for the human body: supports the body. facilitates movement. protects internal organs. and produces blood.

Osteoporosis: This is a disease in which the bones become fragile and prone to fracture.

Leukemia: This is a cancer of the white blood cells.

Osteopenia, osteitis deformans, and osteomalacia: Similar to osteoporosis, these are other types of bone loss.