The first heart sound (S1) occurs because of the closure of the:
A. Aortic and mitral valves
B. Mitral and tricuspid valves
C. Pulmonic valve
D. Aortic valve
ANS: B
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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