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Q.

‘Lub’ sound is produced due to the closure of

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a

semilunar valves

b

Thebesian valve

c

atrioventricular valves

d

Eustachian valve

answer is B.

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Detailed Solution

The first heart sound (lub) is associated with the closure of the atrioventricular (tricuspid and bicuspid) valves at the beginning of ventricular systole.

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‘Lub’ sound is produced due to the closure of