Following the absolute refractory period is a relative refractory period,during which a second action potential can be produced only by a triggering event considerably stronger than usual.

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During the relative refractory period, a second action potential can be produced but only by a stronger triggering event. This is due to the fact that some voltage-gated ion channels are still inactivated or closed, and it takes a stronger depolarization to overcome this state and reach the threshold for another action potential.

Following the Absolute Refractory Period Is a Relative Refractory Period,during