NEET Previous Year Question
Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:
Topic: NEET PYQ
Answer: B. Full step-by-step solution below.
- AVentricular walls vibrate due to gushing in of blood from atria
- BSemilunar valves close down after the blood flows into vessels from ventricles
- CAV node receives signal from SA node
- DAV valves open up
Correct answer: B
Solution
(b) During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. 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.More Body Fluids & Circulation PYQs
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