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As Na ions enter the cell, the membrane potential is further depolarized, and more voltage-gated sodium channels are activated.

The undershoot phase occurs because unlike voltage-gated sodium channels, voltage-gated potassium channels inactivate much more slowly.

Nevertheless, as more voltage-gated K channels become inactivated, the membrane potential recovers to its normal resting steady state..

Neurons are diverse with respect to morphology and function.

Repolarization of the membrane potential continues, resulting in an undershoot phase or absolute refractory period.

Neurons are cells that are specialized to receive, propagate, and transmit electrochemical impulses.

In the human brain alone, there are over eighty billion neurons.

Once bounded with Ca2 , the vesicles dock and fuse with the presynaptic membrane, and release neurotransmitters into the synaptic cleft by a process known as exocytosis.