Events in the cardiac cycle create recognizable heart sounds. What information should the nurse provide the client about the first heart sound?
A) Produced by the closure of the AV valves when the ventricles contract
B) Produced by the closure of the aortic and pulmonary semilunar valves when the ventricles relax
C) Produced when ventricular filling creates audible vibrations during the silent diastolic phase
D) Produced from turbulent blood flow through the heart's chambers and valves
A
Feedback:
The first normal heart sound (S1) is called the "lub"; it is produced by closure of the AV valves when the ventricles contract. The second heart sound (S2) is called the "dub" or "dup"; it is produced by the closure of the aortic and pulmonary semilunar valves when the ventricles relax. Gallop sounds occur when ventricular filling creates audible vibrations during a normally silent diastolic phase. Murmurs are extra heart sounds resulting from turbulent blood flow through the heart's chambers and valves.
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