5. Immune system
“The system of organs, cells and proteins, which protect the body from foreign substances by producing immune responses. The immune system organs include the thymus, spleen, lymph nodes and bone marrow. The cells include white cells, lymphocytes, T cells and B cells. Immunoglobulins (antibodies) are proteins that can react with and/or neutralize corresponding proteins called antigens (usually damaged or foreign material). The immune system is essentially protective and helpful to the body, but can be the cause of disease and allergy when it attacks parts of the normal body in a process called autoimmunity.”
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