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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.These allow Ca2 ions to diffuse through these channels and bind with synaptic vesicles within the terminal boutons.
As Na ions enter the cell, the membrane potential is further depolarized, and more voltage-gated sodium channels are activated.
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Repolarization of the membrane potential continues, resulting in an undershoot phase or absolute refractory period.
The undershoot phase occurs because unlike voltage-gated sodium channels, voltage-gated potassium channels inactivate much more slowly.