The second heart sound (S2) is created primarily by which of the following?
a. Closure of the semilunar valves
b. Opening of the atrioventricular valves
c. Closure of the atrioventricular valves
d. Opening of the semilunar valves
ANS: A
When systole ends, the ventricles relax, and the pulmonic and aortic (semilunar) valves close, creating the second heart sound (S2).
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