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The first heart sound occurs due to the closure of the semilunar valves. True or false?

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in Biology – Class 11 by (272k points)
The first heart sound occurs due to the closure of the semilunar valves. True or false?

(a) True

(b) False

The question was posed to me in an online interview.

My query is from Human Circulatory System topic in section Body Fluids and Circulation of Biology – Class 11

1 Answer

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Best answer
Right choice is (b) False

Best explanation: Two distinct heart sounds are audible with the help of the stethoscope. The first heart sound occurs due to the simultaneous closure of the bicuspid valve and the tricuspid valve. It is heard as a ‘lub’.

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