The second heart sound (S2) occurs because of the closure of the:
A. Aortic valve
B. Tricuspid valve
C. Aortic and pulmonic valve
D. A and B
ANS: C
S1 is the closing of the mitral valve and with the tricuspid (T1) valve; together they are known as the atrioventricular (AV) valves. S2 is the closing of the aortic (A2) and pulmonic (P2) valves; together they are known as the semilunar valves.
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