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Q.

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

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a

neurotransmitters are released by dendrites and not by the axon

b

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

c

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

d

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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