First heart sound is produced due to

closure of the tricuspid

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closure of the bicuspid

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closure of the semilunar valves

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both a and b

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Solution

The correct option is D both a and b
During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance.

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Similar questions

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. State whether the following statements are true or false.
The first heart sound results from a closure of semilunar valves.

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

Q. Read the following statements carefully and select correct choice from given.
(a) First heart sound lub is produced due to closure of atrioventricular valves.
(b) First heart sound is of longer duration than second heart sound dub.

Q. Read the following statements and select the correct option.
A. Damage to chordae tending of semilunar valves in aorta causes back flow of blood in left ventricle.
B. Closure of atrio-ventricular valves during ventricular systole generates first heart sound

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