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

Such a process is also known as a positive feedback loop.

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

This includes morphology and physiological properties of single neurons.

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.

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.

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