host defenses

  1. resistance
    abbility to ward off disease
  2. susceptibility
    lack of resistance
  3. nonspecific resistance
    body defenses that ward off disease without respet to an organism
  4. specific resistance
    attack specific type of organism associated with immune system
  5. physical host difenses
    • intact skin
    • tears and blinking protect eyes
    • saliva washs teeth and gums
    • mucous traps microorganisms
    • urnine and vaginal secretions keep organisms out of genitournary tract
  6. chemical host defenses
    • sebum: unsaturated fats inhibit microorganisms
    • perpiration- high salt washs bacteria
    • lysozymes digest cell walls
    • acid prevents bacterial growth in stomach
  7. phagocytosis
    • ingestion of microorganisms or particles by a cell
    • accomplished by wbc
  8. blood components
    • plasma-water ions and protiens
    • rbc
    • wbc
    • platlets
  9. monocytes
    fixed or wandering
  10. fixed phagocytes
    located in spleen
  11. granulocytes
    eary infection
  12. monocytes
    present in later infection
  13. phagocytes activated
    by bacterial componets or chemical messengers
  14. inflammation
    • a bodily response to cell damage
    • redness, pain, heat, swelling, loss of function
  15. fever
    • high body temp (over 100)
    • produced in response to infection
  16. fever induced by
    • endotoxins, interleukin1 and LPS toxins
    • chill- rising body temp
    • sweating- falling body temp
  17. comlement system
    • a system of protiens that inactivate cells
    • ex interferons
  18. interferons
    group of 8-25 serum portiens that activate each other to destroy cells
Card Set
host defenses
final exam