Problem Set II 2010 Key

Problem Set II 2010 Key - Problem Set II: Cardiovascular...

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Problem Set II: Cardiovascular Physiology 1) Cardiac output in an animal is 300 ml/min. What is the cardiac output if the arterial pressure falls to one-half of its initial value due to vasodilation that doubles the cross- sectional area of the peripheral circulation? To answer this question, assume that Poiseuille's Law applies to the circulation of this animal. SOLUTION: Q = dP/R and R = k/r 4 , so R = k/A 2 (from class notes) thus, the new Q = [(dP) (1/2)] ÷ [(R) (1/4)] = [(1/2)/(1/4)] · 300 ml/min = 600 ml/min 2) The density of blood in a small animal is 1.04 g/cm 3 , and its viscosity in arteries (in vivo) is 3.0 cP. At what velocity of blood flow will turbulence develop in an artery that is 0.5 cm in diameter? (You will need to convert centipoise to poise before solving this problem.) SOLUTION: Turbulence is likely when Re > 2000 (see class notes) Re = vdp/n so, let Re = 2000 and rearrange to solve for v: v = [(2000) (0.03)]/[0.5) (1.04)] = 115.4 cm/s 3) Consider part of a circulatory system hypothetically composed of
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This note was uploaded on 08/24/2011 for the course PCB 4723C taught by Professor Julian during the Fall '08 term at University of Florida.

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Problem Set II 2010 Key - Problem Set II: Cardiovascular...

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