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    Twitch contraction

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

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    https://brainmass.com/biology/human-anatomy-and-physiology/twitch-contraction-36346

    Solution Preview

    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 ...

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