★ Anatomy and Physiology- Cardiovascular Sysytem Quiz
How can the circulatory system promote heat retention/conservation, such as on a cold day?
A. Vasoconstriction
B. Vasodilation
C. Decreasing tunica media contraction
D. Increasing capillary surface area
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At the instant following the second heart sound, which heart valves are open?
A. Both atrioventricular valves and semilunar valves
B. Atrioventricular valves only
C. All valves are closed
D. Semilunar valves only
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