The first heart sound lub is produced due to

closure of bicuspid and tricuspid valves

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closure of semilunar valves

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opening of bicuspid and tricuspid valves

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none of these

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Solution

The correct option is A closure of bicuspid and tricuspid valves
All the events that occur during one heart beat constitute cardiac cycle.
During cardiac cycle, two prominent sounds are heard.
The first heart sound lub is produced due to the closure of bicuspid and tricuspid valves.
The second heart sound dub is produced during the closure of semilunar valves.

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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. Bicuspid and tricuspid valves are open during

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.

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