A nurse auscultates heart sounds. When the nurse hears S2, which valves is the nurse hearing close?
a. Aortic and mitral
b. Mitral and tricuspid
c. Aortic and pulmonic
d. Mitral and pulmonic
ANS: C
As the ventricles empty, the ventricular pressures decrease, allowing closure of the aortic and pulmonic valves, producing the second heart sound, S2. The mitral and tricuspid produce the first heart sound, S1. The aortic and mitral do not close at the same time. The mitral and pulmonic do not close at the same time.
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