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

  • Option 1)

    Ventricular walls vibrate due to gushing in of blood from atria

  • Option 2)

    Semilunar valves close down after the blood flows into vessels from ventricles

  • Option 3)

    AV node receives signal from SA node

  • Option 4)

    AV valves open up

 

Answers (1)

As we learnt in 

Lub-dub -

During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope.

- wherein

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.

 

 The second heart sound (dub) is associated with the closure of the similarly value.


Option 1)

Ventricular walls vibrate due to gushing in of blood from atria

Incorrect

Option 2)

Semilunar valves close down after the blood flows into vessels from ventricles

Correct

Option 3)

AV node receives signal from SA node

Incorrect

Option 4)

AV valves open up

Incorrect

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