The first heart sound is semilunar valves

Closure of the tricuspid and Biscuspid valves

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Closure of the tricuspid and biuspid valves

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Opening of the semilunar valves

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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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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.

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

Q. Bicuspid and tricuspid valves are open during

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