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Immunity (medical)

In biology, immunity is the balanced state of multicellular organisms having adequate biological defenses to fight infection, disease, or other unwanted biological invasion, while having adequate tolerance to avoid allergy, and autoimmune diseases.

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The mammalian immune system is broken down into the humoral and cell-mediated responses. The humoral response is activated by antibodies released from plasma cells which replicated from a B cell activated by a helper T cell. In the cell-mediated response, cytotoxic T cells, also activated by helper T cells, bind to an infected host cell and lyse it through releasing perforins which allow water and ions to rush into the cell.

Contributed by Plamen Kamenov

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