Question

Why is the flow of signals in a synapse from axonal end of one neuron to dendtritic end of another neuron but not the reverse?

Answer 1

The flow of signals through neurons takes place in the form of specialized chemicals; called neurotransmitters. The neurotransmitters can only enter a neuron through dedicated receptor channels. Such receptor channels are only present at the dendritic end but not at the axonal end. Hence, the flow of signals in a synapse happens from axonal end of one neuron to dendritic end of another neuron but not in the reverse direction.

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