HSII Ch 1 Key Terms

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HSII Ch 1 Key Terms
2012-09-05 19:40:03
key terms

key terms
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  1. Anatomy
    • study of the structure of an o/g & the relationships of its parts
    • Greek for "cutting up"
  2. physiology
    study of functions of living o/g & their parts
  3. dissection
    technique used to isolate & study structural components/parts of human body
  4. hypothesis
    • tentative explanation
    • reasonable guess based on previous informal observations/tested explanations
  5. experimentation
    designed to be as simple as possible to aviod possibility of errors
  6. theory or law
    a hypothesis that has gained a high lvl. of confidence
  7. feedback loop
    basic type of homeostatic control system in the body
  8. sensor
    detects change in temperature
  9. control center
    comapres actual temperature w/normal temperature & responds by activating body's effector (furnace)
  10. effector
    effects controlled condition (temperature)
  11. negative feedback loops
    • oppose/negate a change in a controlled condition
    • reverses change to a normal value to stabilize conditions
  12. positive feedback loops
    • involved in normal function
    • stimulatory
    • temporarily amplify the change
  13. developmental processes
    changes & functs. occur during early years
  14. aging process
    changes & functs. occur after young adulthood
  15. survival
    depends on body's ability to maintain/restore homeostasis
  16. chemical level of organization
    atoms and molecules
  17. existence of life depends on...
    • proper lvls & proportions of many chemical stubstances in the cells
    • homeostatsis
  18. organizational structure
    cells, tissues, organs, systems, organism 
  19. cells are held together by
    varying amts. & varities of gluelike, nonliving intrercellular substances
  20. body as a whole
    all the atoms, molecules, cells, tisues, organs, & systems 
  21. anatomical position
    • erect
    • arms @ sides
    • palms forward
    • head & feet pointed forward
  22. to recognize an object
    first notice overall structure & form
  23. atrophy
    degenerative process where peak of health is at young adulthood
  24. homeostasis
    relative constancy of internal environement
  25. feedback loop diagram
    • cold wind= DISTURBANCE
    • body temperature (CONTROLLED CONDITION) is detected by col receptors (SENSOR)
    • feeds back to actual body temperature
    • brain (CONTROL CENTER) lowers body temp. to normal body temp.
    • which signals muscles to shiver (EFFECTOR) to increase body temperature
  26. example of negative feedback loops
    • breathing hard during exercise to get blood O2 back to normal
    • urinating when fluid volume in the body > normal
  27. example of positive feedback loops
    • rapid contractions before giving birth
    • blood cells rapidly sticking together (platelets) to form a blood clot