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Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.

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

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.

Briefly, the model states that the generation of an action potential is determined by two ions: Na and K .

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

Cellular neuroscience is the study of neurons at a cellular level.

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

When ionotropic receptors are activated, certain ion species such as Na to enter the postsynaptic neuron, which depolarizes the postsynaptic membrane.

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

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

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