IMG_0003 - The Immune System(Chapter 15 I DEFENSE...

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The Immune System (Chapter 15) I. DEFENSE MECEANISMS: The immune system provides defense against potential palhogens. 1. Nonspecific (innate) defense mechanisms are inherited as part of the structure of each organism. i.e. : Epithelial membranes restrict infections Acidity of gastric juices kill microorganisms These internal defenses are backed by intemal defenses such as phagocytosis. 2. Speci{ic (acquired) defense which is a function of lymphocltes, is the abiiity to defendagainst specffic pathogens. A) NONSPECIFIC IMMTINITY: Bacteria that enter connective tissue secrete toxins that may enter blood and be carried to other parts of the body. To counter the invasion nonspecific defenses are employed. trf they are not sufficient, lymphocytes are recruited to reinforce the defense. 1. PEAGOCYTOSIS: The major groups of phagocytic ce1ls are neutrophils, mononuclear (i.e.: monocl'tes in the blood and macrophages in the connective tissues), and organ specific (i.e.: microglia). Fixed phagocltes are immobile in the sinusoids. Chemicals and debris
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  • Spring '11
  • Dr.Abdirkin
  • elevated body temperature, invasion nonspecific defenses, free lysosomal enzymes, connective tissue secrete, major groups

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