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Reported Question / Answer
Q.) During heavy exercise the cardiac output (CO) increases upto five fold while pulmonary arterial pressure rises very little. This physiological ability of the pulmonary circulation is best explained by:
1)
Large amount of smooth muscle in pulmonary arterioles
2)
Smaller surface area of pulmonary circulation
3)
Increase in the number of open capillaries
4)
Sympathetically mediated greater distensibility of pulmonary vessels
5)
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Answer :
3
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