During exercise, cardiac output increases dramatically, but mean arterial blood pressure rises very little. Why is this so?
a. Venules constrict, increasing vascular re-sistance.
b. Arterioles dilate, decreasing vascular ca-pacity.
c. Arterioles constrict, increasing vascular resistance.
d. Muscle vessels dilate, increasing vascular capacity.
ANS: D
For example, when exercising, the circulating blood volume undergoes a relative increase, but blood pressure remains near normal. This is because the skeletal muscle vascular beds dilate, causing a large increase in system capacity.
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