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(A) The movement of the nerve impulse across the synaptic cleft is primarily a chemical event. This process is mediated by chemical messengers known a

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$A$ chemical event

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(A) The movement of the nerve impulse across the synaptic cleft is primarily a chemical event. This process is mediated by chemical messengers known as neurotransmitters,such as acetylcholine $(ACh)$,gamma-aminobutyric acid $(GABA)$,norepinephrine,and serotonin. When an action potential reaches the axon terminal,it triggers the release of these neurotransmitters into the synaptic cleft,which then bind to receptors on the postsynaptic membrane to propagate the signal.

The movement of the nerve impulse across the synaptic cleft is primarily

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