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An action potential can be divided into several sequential phases: threshold, rising phase, falling phase, undershoot phase, and recovery.

Following several local graded depolarizations of the membrane potential, the threshold of excitation is reached, voltage-gated sodium channels are activated, which leads to an influx of Na ions.

After neurotransmitters are synthesized, they are packaged and stored in vesicles.

These vesicles are pooled together in terminal boutons of the presynaptic neuron.

The Hodgkin–Huxley model of an action potential in the squid giant axon has been the basis for much of the current understanding of the ionic bases of action potentials.

Ionotropic receptors are a combination of a receptor and an ion channel.

Moreover, the distinctions based on function between neurons and other cells such as cardiac and muscle cells are not helpful.

Thus, the fundamental difference between a neuron and a nonneuronal cell is a matter of degree.

As the rising phase reaches its peak, voltage-gated Na channels are inactivated whereas voltage-gated K channels are activated, resulting in a net outward movement of K ions, which repolarizes the membrane potential towards the resting membrane potential.

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

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