Each cardiac cycle lasts about sec...

Each cardiac cycle lasts about _______ second

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(i) The sequence of events occurring from the beginning to the completion of one heart beat is called cardiac cycle .
(ii ) During cardiac cycle blood flows through the chambers of the heart in a specific direction .

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Doctors use stethoscope to hear the sound, produced during each cardiac cycle. The second sound is heard when:

AV node receives signal from SA node

AV valves

Ventricular wall vibrate due to gushing of blood from atria

Normal gestation period of human last for about ________days.

280

380

480

580

Each cardiac cycle lasts about _______ second

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Doctors use stethoscope to hear the sound, produced during each cardiac cycle. The second sound is heard when:

Normal gestation period of human last for about ________days.

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