First heart sound occurs at:

Opening of semilunar valves

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Closing of semilunar valves

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Onset of atrial systole

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Sudden closure of AV valves

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Solution

The correct option is D Sudden closure of AV valves
Heart sounds always occur due to the closure of the valves. The first heart sound 'LUBB' is heard during ventricular contraction due to the closure of atrioventricular valves. It prevents the backflow of the blood from the ventricles into the atria.

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Similar questions

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

Q. The first heart sound is semilunar valves

Q. Time interval between the closure of semilunar valve and closure of AV valve is?

Q. The time interval between the closure of semilunar valve and the closure of AV valve is _____________.

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

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