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Such a process is also known as a positive feedback loop.
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.
The undershoot phase occurs because unlike voltage-gated sodium channels, voltage-gated potassium channels inactivate much more slowly.
In the human brain alone, there are over eighty billion neurons.
Neurons are diverse with respect to morphology and function.
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.
As Na ions enter the cell, the membrane potential is further depolarized, and more voltage-gated sodium channels are activated.