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Problem Set II 2010 - a Estimate the total resistance for...

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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. 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.) 3) Consider part of a circulatory system hypothetically composed of six circuits arranged in parallel. Each component circuit has a resistance of 5 PRU. (For dimensions, assume that pressures are measured in mm Hg, and blood flow in ml/min.)
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Unformatted text preview: a. Estimate the total resistance for this part of the circulation. b. Estimate the total resistance in this system IF the six component circuits (each having an individual resistance as given above) were arranged "in series" instead of in parallel. c. If the drop in pressure across the entire set of circuits being considered in part "a" is 70 mm Hg, estimate the rate of blood flow (Q, in ml/min) through each part of the circuit. d. If there was a need to increase the rate of blood flow through four of the parallel circuits in part "a" and decrease the rate of blood flow in the remaining two circuits, how could these goals be accomplished physiologically? 4) Pressure increases in sea water approximately at the rate of one atmosphere per 10 meters depth. Calculate the pressure of sea water at one mile depth and express your answer in pascals (Pa)....
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