Question

During exercise, cardiac output may increase by more than 170% to meet the body’s increased O₂ demands. This increase in cardiac output increases blood pressure. But the accompanying increase in arterial pressure is relatively small—only about 40%. What limits this increase in blood pressure so that it doesn’t reach dangerously high levels during exercise?a. Blood vessels shorten in the contracting skeletal muscles.b. Blood volume decreases due to sweating.c. Vasodilation causes arterial diameter to increase in the exercising skeletal muscle.d. Hematocrit decreases as more interstitial fluid enters the blood vessels.

Answer 1

Answer:

c. Vasodilation causes arterial diameter to increase in the exercising skeletal muscle

Explanation:

Cardiac output increases blood pressure due to increased pumping action of the heart. To protect the blood pressure to rise to the fatal levels during exercise or any other activity of excessive muscle contraction, blood vessels are stimulated to dilate.

Dilation of arteries dissipates some of the blood pressure. The arteries with larger diameter have less blood pressure than the arteries with a narrow cavity under the conditions of the same cardiac output. Therefore, the dilation of arteries Dilation does not allow the blood pressure to rise to the harmful levels.