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NEET · Biology · STD 11 - 15. Body fluids and criculations
Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when
- A \(AV\) node receives signal from \(SA\) node
- B \(AV\) valves open up
- C Ventricular walls vibrate due to gushing in of blood from atria
- D Semilunar valves close down after the blood flows into vessels from ventricles.
Answer & Solution
Correct Answer
(D) Semilunar valves close down after the blood flows into vessels from ventricles.
Step-by-step Solution
Detailed explanation
(d) : Second heart sound \(i.e.\), dup is caused by the closure of the semilunar values and marks the end of ventricular systole.
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