phys 36,37.txt

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Author:
kepling
ID:
64158
Filename:
phys 36,37.txt
Updated:
2011-02-04 19:21:13
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Phys
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Phys 36,37
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  1. Where do the great and coronary veins drain into the heart?
    Coronary sinus
  2. Where do the anterior veins of the heart drain?
    Right atrium
  3. what are the two coronary arteries?
    L/R coronary artery
  4. Which coronary artery feels more compression?
    • Left coronary artery
    • ***therefore, it will have a higher flow when the aortic valve closes
  5. What happens to coronary circulation in times of hemorrhage and ischemia?
    • Decreases
    • Must increase vasoconstriction of periphery to shunt blood back to brain
    • up TPR - up MAP - up Cerebral flow
  6. How does the Baroreceptor reflex function?
    • When Bf increases or Pressure increases there is more of a stretch in the arteries
    • stretch = active baroreceptor = down sympathetic innervation = vasodilation
    • no stretch = inactive baroreceptor = up sympathetic innervation = vasoconstriction
  7. At what % of skeletal muscle pumping does blood flow stop?
    70%
  8. What is the major control of cutaneous circulation?
    Heat
  9. Where does blood shift in cutaneous circulation during hypo/hypervolemia?
    • Hypo: internal
    • Hyper: cutaneous
  10. What are the two types of resistance vessels in cutaneous circulation?
    • Arteriovenous anastomoses (AVAs)
    • Arterioles
  11. What mainly controls AVAs?
    SNS
  12. When do AVAs open?
    • body heated
    • body really cold

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