2024 Re-NEET Body Fluids and CirculationCardiac cycle and heart sounds Medium Question 11 of 83 in Body Fluids and Circulation

'Lub' sound of Heart is caused by the ________.

A closure of the semilunar valves
B opening of tricuspid and bicuspid valves
C opening of the semilunar valves
D closure of the tricuspid and bicuspid valves

The answer is D.

Solution

The first heart sound ('lub') is produced by the closure of the atrioventricular (tricuspid and bicuspid/mitral) valves at the start of ventricular systole.

Concept Cardiac cycle and heart sounds

Body Fluids and Circulation in past papers

83 questions from this chapter have appeared across 27 exam years.