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Q.

‘Dub’ sound is produced during

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a

atrial systole

b

diastasis

c

ventricular systole

d

ventricular diastole

answer is D.

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Detailed Solution

The second heart sound (dub) is associated with the closure of the semilunar valves during isovolumetric relaxation phase of joint diastole. Joint diastole has three phases: isovolumetric relaxation, rapid ventricular filling, slow ventricular filling (diastasis).

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