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Immunity - Introduction A state of having sufficient biological defenses to avoid infection, disease, or other unwanted biological invasion.
Capability of the body to resist harmful microbes from entering the body. |
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Types of immunity Immunity Innate Adaptive Natural Artificial Passive
(maternal) Active
(infection) Passive
(Ab transfer) Active
(Immunization) |
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Innate immunity (first line of defense) |
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First line of defense |
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Adaptive Immunity Humoral response Cell- mediated response Extra cellular microbes B lymphocytes Elimination of microbes Phagocytosed microbes in macrophage Dendritic cells display antigen to T cells Intracellular microbes within infected cell T cells release cytokines Activation of macrophage to kill microbes Lysis of infected cell |
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When antigen enters… antigen |
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Natural adaptive immunity |
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