BIOL 201 Lecture Notes - Anatta, Antibody, Antigen

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11 Feb 2013
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Virus enter cell and more difficult to remove. No antibodies involved / work directly on the infected cell by destroying it. Special proteins called major histocompability complex (mhc) are present on all human cells. Non-self antigen interacts with mhc as human cell becomes infected by a pathogen. Specific t-lymphocyte recognises specific non-self antigen only with a chemical marker next to it (mhc) Activated t-lymphocytes multiply by mitosis and enter circulation. Destroyed by hiv: suppressor t-cells switch off the t and b cell responses when infection clears, memory t-cells some activated t-cells remain in the circulation and can respond quickly when same pathogen enters body again. Active (antibodies made by the human immune system, long term acting due to memory cells) Vaccination (injection of the antigen in a weakened form) Injection of antibodies from an artificial source, e. g. anti venom against snake biter. How vaccines produce responses by the immune system.

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