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Human Health and Disease
Question
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Refractory period of a muscle fibre in mammals is

  • 0.8001 sec

  • 0.002 sec

  • 0.004 sec

  • 0.005 sec

Answer

B.

0.002 sec

After an action potential initiates, the cardiac cell is unable to initiate another action potential for some duration of time (which is slightly shorter than the 'true' action potential duration). This period of time is referred to as the refractory period, which is 250ms in duration and helps to protect the heart.

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