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Question

The first heart sound is semilunar valves

A
Closure of the tricuspid and Biscuspid valves
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B
Closure of the tricuspid and biuspid valves
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C
Opening of the semilunar valves
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D
Opening of the eustachian valve
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Solution

The correct option is C Closure of the tricuspid and Biscuspid valves
The first heart sound which we hear is produced by the simultaneous closure of both the atrioventricular valves namely, the bicuspid (mitral) valve and the tricuspid valve.
It resembles the word "LUBB" and is produced due to the isometric contraction period and the earlier part of ejection period.

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