Q.

Select the incorrect statement about the first heart sound.

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a

It is described as ‘lub’ sound.

b

It is due the closure of tricuspid and bicuspid valves.

c

It is a bit longer than the second heart sound sound.

d

It occurs at the beginning of joint diastole.

answer is D.

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Detailed Solution

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves. It occurs at the beginning of ventricular systole. Compared to the second heart sound (dub), t is longer, less loud and low-pitched.

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