The first heart sound is produced when

Intraventricular pressure decreases.

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Semilunar valve snaps shut.

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Bicuspid and tricuspid valve close quickly.

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Diastole begins.

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Solution

The correct option is C Bicuspid and tricuspid valve close quickly.
The lub is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound, dub or S2, is caused by the closure of aortic and pulmonary valves, marking the end of systole.
So, the correct answer is option C.

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Similar questions

The second heart sound (dubb) is associated with the closure of ?
(a) tricuspid valve
(b) semilunar valve
(c) bicuspid valve
(d) tricuspid and bicuspid valve

Heart sounds are produced due to
(a) Closure of tricuspid and bicuspid valves
(b) Rushing of blood through valves producing turbulence
(c) Closure of atrioventricular and semilunar valves
(d) Entry of blood into auricles

Q. Why heart has valves at all the apertures? Write about the bicuspid and tricuspid valves.

Q. Which of the following events does not take place during a ventricular systole
i. Due to the ventricular systole, ventricular pressure decreases.
ii. During the end of ventricular systole the semilunar valves open up.
iii. During the start of the ventricular systole the bicuspid and tricuspid valves close
iv. Due to the closure of the atrio-ventricular valves, dup sound is produced.

The valve situated between the left atrium and the left ventricle is called

(1) Bicuspid valve (2) Tricuspid valve (3) Mitral valve (4) Eustachian tube

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