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12 Cards in this Set

  • Front
  • Back
How do you upregulate cardiac output?
1. increase heart rate
2. increase stroke volume
How to increase stroke volume?
1. Increase preload (Starling's law)
2. increase sympathetic stimulation
3. decrease arterial pressure
ruptured artery
restricted blood supply
tissue death
Poiseullie's equation
Flow Q (mL/min) = pi(deltaP)r^4/8nl
Resistance equation
R = deltaP/Q = 8nl/pi r^4

turbulent flow ~ 1/r^5
What muscle fibers do arteries contain that give it is elasticity?
Elastin, collagen
What two things do reduced vessel radius lead to?
increased resistance, decreased arterial elasticity ==> both lead to high blood pressure
What factors do arteries and arterioles respond to?
Extrinsic, vasoconstricting
1. sympathetic nervous system
2. hormones (epinephrine, norinephrine)
Intrinsic, vasodilating
3. local chemical factors (NO) that enhance blood flow
steady state
aerobic metabolism increases energy production until this state, which is the amount of energy that the muscles require. aerobic metabolism won't go past this steady state - it won't produce more than the muscles demand.
"the wall"
when glycogen levels decrease and the body starts relying more on fat