During a nerve action potential, a stimulus is delivered as indicated by the arrow shown in the following figure. In response to the stimulus, a second action potential

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[IV E 3 a]. Because the stimulus was delivered during the absolute refractory period, no action potential occurs. The inactivation gates of the $\mathrm{Na}^{+}$channel were closed by depolarization and remain closed until the membrane is repolarized. As long as the inactivation gates are closed, the $\mathrm{Na}^{+}$channels cannot be opened to allow for another action potential.

During a Nerve Action Potential, a Stimulus Is Delivered as Indicated