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14 May, 03:17

Sustained exercise can increase the blood flow rate of the heart by a factor of five with only a modest increase in blood pressure. This is a large change in flow. Although several factors come into play, which of the following physiological changes would most plausibly account for such a large increase in flow with a small change in pressure?

A. A decrease in the viscosity of the blood

B. Dilation of the smaller blood vessels to larger diameters

C. Dilation of the aorta to larger diameter

D. An increase in the oxygen carried by the blood

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Answers (2)
  1. 14 May, 04:24
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    B. Dilation of the smaller blood vessels to larger diameters
  2. 14 May, 04:31
    0
    Answer:B

    Explanation: During exercise, smaller blood vessels responsible for the flow of blood in the body dilate to allow increased flow of blood with little pressure. The dilated vessels increase blood flows which allows for the circulation of oxygenated blood to the muscles.
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