The typical 'Lubb-Dup' sounds heard in the he | vedclass

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Question

(C) The first heart sound,'$Lubb$',is a low-pitched,long-duration sound produced primarily by the closure of the atrioventricular valves (tricuspid an

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Closing of the atrioventricular and semilunar valves

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(C) The first heart sound,'$Lubb$',is a low-pitched,long-duration sound produced primarily by the closure of the atrioventricular valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.The second heart sound,'$Dup$',is a high-pitched,short-duration sound produced by the closure of the semilunar valves (aortic and pulmonary valves) at the beginning of ventricular diastole.Therefore,the combination of these two sounds is due to the sequential closing of the atrioventricular valves followed by the semilunar valves.

Column-$I$	Column-$II$
$(a)$ Tricuspid valve	$(i)$ Between left atrium and left ventricle
$(b)$ Bicuspid valve	$(ii)$ Between right ventricle and pulmonary artery
$(c)$ Semilunar valve	$(iii)$ Between right atrium and right ventricle

The typical 'Lubb-Dup' sounds heard in the heartbeat of a healthy person are due to:

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