Question

Question: Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?
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Answer 1

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Answer: As the electrical impulse reaches the axon terminal in the region of axon-dendrite synapse, it stimulates the exocytosis of vesicles containing. . neurotransmitter. Neurotransmitter attaches to the chemoreceptor sites of the membrane covering the dendrite end of synapse. It creates a new impulse that travels through cell body and sxon of the second neuron. At synapse, the axon end does not contain any chemoreceptor sites so that reverse flow of electrochemical impulses is not possible.

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Answer 2

We know that electrical singanl when reaches the axonal end of a neuron some Chemical substnace is released. Which is responsible for to generate same impure on

another neuron.

Clearly, electrical signal is converted to Chemical signal at the axonal end. Now, these chemicals are absent at the dendritic end of the neuron, the electrical signal cannot be converts into Chemical signal.