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Q.

Lub sound is produced by the closure of

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a

semilunar valves due to a rise in ventricular pressure

b

semilunar valves due to a fall in ventricular pressure

c

atrioventricular valves due to a rise in ventricular pressure

d

atrioventricular valves due to a fall in ventricular pressure

answer is C.

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Detailed Solution

During ventricular systole, the pressure in the ventricles rises due to the contraction of the ventricles. This causes the closure of atrioventricular valves to prevent the backflow of blood into the atria.

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