Why is the flow of signals in a synapse from | vedclass

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(D) When an electrical impulse reaches the axonal end (synaptic knob) of a neuron,it triggers the release of chemical substances known as neurotransmi

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(D) When an electrical impulse reaches the axonal end (synaptic knob) of a neuron,it triggers the release of chemical substances known as neurotransmitters into the synaptic cleft.These chemicals diffuse across the synapse towards the dendritic end of the adjacent neuron.At the dendritic end,these chemicals bind to specific receptors to generate a new electrical impulse.Since the neurotransmitters are stored only in the synaptic vesicles at the axonal end and the receptors are located only on the dendritic membrane,the signal can only flow in one direction: from the axon of one neuron to the dendrite of another.

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

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