Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The first sound is heard when:

Ventricular walls vibrate due to pushing in of blood from atria

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Semilunar valves are closed

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AV node receives signal from SA node

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The tricuspid and bicuspid valves are closed

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Solution

The correct option is D The tricuspid and bicuspid valves are closed
During each cardiac cycle two prominent sounds are produced which can be heard by stethoscope. The first heart sound (lub) is associated with the closure of bicuspid and tricuspid valves while the second heart sound (dub) is associated with a closure of the semilunar valves.

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Similar questions

Q. Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The first sound is heard when:

Doctors use stethoscope to hear the sound ; Produced during each cardiac cycle. The second sound is heard when:

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.

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. Very short answer type.
Name the heart sounds as heard by stethoscope, caused due to:
closure of AV valves at the start of ventricular systole

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