All of the following are features of exercise EXCEPT:
AIncreased blood supply to muscles
BIncreased O₂ extraction
CIncreased stroke volume
DLeft shift of Hb-O₂ dissociation curve
During heavy exercise the cardiac output (CO) increases up to five fold while pulmonary arterial pressure rises very little. This physiological ability of the pulmonary circulation is best explained by
ALarge amount of smooth muscle in pulmonary arterioles
BIncrease in the number of open capillaries
CSympathetically mediated greater distensibility of pulmonary vessels
DSmaller surface area of pulmonary circulation
Which of the following statements is true about red muscle fibers?
AContain fewer mitochondria than white muscle fibers
BHave less myoglobin than white muscle fibers
CExhibit more oxidative capacity
DUtilize glycolytic metabolism
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