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Choose the correct statement among the f...

Choose the correct statement among the following

A

AV node is the pacemaker that generates action potential and initiates atrial systole.

B

During each cardiac cycle, the 'lubb' sound is due to closure of semilunar valves.

C

Stroke volume in each cardiac stroke is about 170 ml. of blood.

D

QRS complex in the ECG indicates depolarization of ventricles

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The correct Answer is:
D
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