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Twitch contraction

Hi-Please explain what the refractory period is and when it happens-before or after relaxation? Thanks.

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The refractory period is the period of time during which an excitable cell, such as a muscle cell, cannot generate another action potential. It usually lasts about 1-2 msec.

It is divided into two parts, the absolute refractory period and the relative refractory period.

The ...