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The human body within

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The immune system

Gabriele

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Any substance capable of producing an immune response is known as an antigen.

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The immune system

Three lines of defence

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Skin and mucous membranes

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Phagocytosis

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antibodies

Phagocytes

B-lymphocytes

T-lymphocytes (cytotoxic, helper, suppressor)

Monocytes

Macrophages

Neutrophils

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The cells of the immune system

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Antibodies are secreted by lymphocytes B and they can match and counteract any antigen.