Doctors suggest that during long periods of sitting, you should flex and extend your feet at the ankles periodically and squeeze your calf muscles to assist with blood circulation. Why would non-exercise muscle contraction affect blood flow and cardiovascular health?
A. Contraction of muscles stimulates the arteries to vasodilate, reducing blood pressure.
B. Contraction of the leg muscles stimulates baroreceptors to signal the autonomic nervous system and decrease blood pressure and heart rate from multiple fronts.
C. Contraction of muscles itself increases heart rate and burns calories, keeping the heart strong and assisting in maintaining healthy weight.
D. Contraction of the leg muscles squeezes leg veins, which functions as a pumping mechanism to return deoxygenated blood to the heart.
Answer: D
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