Immune system

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The main defense of the body. It defends the body from all illnesses and diseases. The human body would most likely die without it.

Thymus
Bone marrow
Spleen
Tonsils
Lymph Nodes
Lymph Vessels
Adenoids
Liver

Disease:
AIDS - an acquired viral infection that weakens the immune system by destroying important white blood cells. Most people can fight off infections that people with HIV/AIDS become seriously ill with. These infections are called "opportunistic infections" because they take advantage of weak immune system.

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