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immune system

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

immune system System by which the body defends itself against disease. It involves many kinds of leucocytes (white blood cells) in the blood, lymph and bone marrow. Some of the cells (B-cells) make antibodies against invading microbes and other foreign bodies (antigens), or neutralize toxins produced by pathogens, while other antibodies encourage two types of leucocytes, phagocytes and macrophages, to attack and digest invaders. T-cells also provide a variety of functions in the immune system. See also interferon

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