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Question

The heart sounds normally heard by a physician while holding a stethoscope onto the left side of the chest of the patient are due to

A
Contraction of atrial chambers.
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B
Contraction of ventricular chambers.
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C
Closure of the atrioventricular valves.
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D
Relaxation of the semilunar valves.
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Solution

The correct option is C Closure of the atrioventricular valves.
In healthy adults, there are two normal heart sounds often described as a lub and a dub, that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves (AV) and semilunar valves respectively.

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