Answer:
Refractory period
Explanation:
The refractory period is the time interval after the beginning of an action potential. During this time, neurons can not fire the next action potential irrespective of the presence of a threshold stimulus. This occurs so as to ensure the unidirectional flow of the nerve impulses. The absolute refractory period occurs when the Na+ channels are activated and then inactivated. These inactive channels are required to resume the resting stage before they can reopen.
