BIOL121 Lecture Notes - Lecture 9: Mast Cell, Sebaceous Gland, Antigen

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13 Oct 2018
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2. 11 define the term antigen: antigens are substances that the immune system perceives as being foreign and induces an immune response in the body, especially the production of antibodies which specifically react with the antigens. 2. 13 discuss the non-specific defences with reference to the following: 2. 13. 1 portals of entry: these are routes through which an antigen or pathogen enters its new host, the main portals of entry include. Urinary and reproductive tracts through sexual contact. Break in protective skin barrier through trauma and cuts. 2. 15 dis(cid:272)uss the (cid:271)ody"s se(cid:272)o(cid:374)d-line defence mechanism with reference to the following: 2. 15. 1 phagocytes: neutrophilis: these are easily deformable cells first to move out of the blood vessels, they phagocytose bacteria release their contents to kill it and eventually form pus. Like the classical pathway the alternative pathway ends with the conversion of inactive c3 protein and the activated c3b protein. Inflammation is a localized tissue response to injury: aims of inflammations:

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