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The human body within The immune system Gabriele Any substance capable of producing an immune response is known as an antigen. The immune system Three lines of defence Skin and mucous membranes Phagocytosis antibodies Phagocytes B-lymphocytes Monocytes T-lymphocytes (cytotoxic, helper, suppressor) Macrophages Neutrophils The cells of the immune system Antibodies are secreted by lymphocytes B and they can match and counteract any antigen.