Impulse transmission through a chemical synapse is always unidirectional, because the

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pre-synaptic and post-synaptic membranes are in close proximity

neurotransmitters are released by dendrites and not by the axon

pre-synaptic and post-synaptic membranes are separated by synaptic cleft

neurotransmitters are released by axon and not by the dentrites

answer is D.

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Detailed Solution

Because neurotransmitters are released by the axon terminals and not by the dendrites, the transmission of the signal is generally unidirectional, from the axon terminals (presynaptic neuron) to the dendrites (postsynaptic neuron).

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