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Explain the physiology of the defence mechanisms in animals.
Member rating: No Rating | Words: | Submitted: Mon Nov 24 2003
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Explain the physiology of the defence mechanisms in animals a) Description of the constitutive or non-specific resistance is accurate. b) Outline of the humoral and cell-mediated constituents of the mammalian immune system is accurate. c) Explanation of the consequences of antigen-antibody interaction is accurate. a) A mammal defends itself against infectious diseases by constitutive resistance, this includes surface barriers, circulatory system, phagocytosis and the inflammatory response. The surface barriers are of physical, chemical and biological barriers. Physical barriers include the skin and mucus membranes that helps prevent entry of pathogens. Chemical barriers include stomach acid, sebum, tears and saliva these help destroy bacteria and pathogens. Biological barriers include sweeping cells in respiratory areas these move mucus and trapped materials away from it. The circulatory system contains white blood cells, phagocytes and lymphocytes. Phagocytes engulf and digest nonself materials and lymphocytes are most abundant. Lymphocytes consist of two types, B and T cells, the B cells...
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