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Posted by / 26-Nov-2017 08:04

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.Some neurons such as photoreceptor cells, for example, do not have myelinated axons that conduct action potentials.

The neurotransmitters then diffuse across the synaptic cleft and bind to postsynaptic receptors embedded on the postsynaptic membrane of another neuron.When ionotropic receptors are activated, certain ion species such as Na to enter the postsynaptic neuron, which depolarizes the postsynaptic membrane.If more of the same type of postsynaptic receptors are activated, then more Na will enter the postsynaptic membrane and depolarize cell.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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Neurons are diverse with respect to morphology and function.

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