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22-Jul-2016 19:45

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.Plastic change often results from the alteration of the number of neurotransmitter receptors located on a synapse.There are several underlying mechanisms that cooperate to achieve synaptic plasticity, including changes in the quantity of neurotransmitters released into a synapse and changes in how effectively cells respond to those neurotransmitters.Some neurons such as photoreceptor cells, for example, do not have myelinated axons that conduct action potentials.Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.As Na ions enter the cell, the membrane potential is further depolarized, and more voltage-gated sodium channels are activated.

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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.Neurons are diverse with respect to morphology and function.



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