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The immune system is the body's defense against infectious organisms and other invaders. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade body systems and cause disease. some of the major organs here are the lymphatic tissues such as spleen tonsils, lymph vessels and skin. some diseases are asthma and allergys.

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The nervous system is made up of all the nerve cells in your body. The nervous system takes in information through our senses, processes the information and triggers reactions, such as making your muscels move or causing you to feel pain. For example, if you touch a hot plate, you reflexively pull back your hand and your nerves simultaneously send pain signals to your brain. a major organ in the nervous system is the spinal cord. a disease caused by the nervous system is Parkinson's disease.

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The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs.a major organ in this system is the reproductive organs. a disease assosiated with this system is cushings disease, this disease is cuased by the overproduction of the pituitary gland.

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the circulatory syste is made up of different organs and vessles that are responsible for the flow of blood throught the body. without this system the body would not be able to fight disease or infections. some major organs of this system are the heart the veins, arterie and lungs. a stroke is one of the many cuases of death in the circulatory system

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Our lungs are among our largest vital organs. The oxygen you breathe in goes into your lungs and passes into your blood from there. It is then transported to all the cells in your body through your bloodstream.Lung cancer is often associated with smoking, but the disease can affect non-smokers as well. Every year, about 16,000 to 24,000 Americans die of lung cancer, even though they have never smoked.

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The integumentary system is an organ system consisting of the skin, hair, nails, and exocrine glands. The skin is only a few millimeters thick yet is by far the largest organ in the body. a disease asoosiated with this system is skin cancer which is cuased by standing in the sun without sun block.

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Muscles are special type of tissues of human body that posess the ability of contraction and relaxation. They can contract actively by producing force for different body movements.a disease assosiated with this system is dystrophy, a disease that makes your muscles weak.

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Skeletal system is the system of bones, associated cartilages and joints of human body. Together these structures form the human skeleton. a disease assosiated with this system is osteoporosis, which makes the bones brittle and weak.some major organs in this system are ligaments, tendons and joints