A) a chemical event
B) a physical event
C) an electrical event
D) a biological event
Correct Answer: A
Solution :
Movement of the nerve impulse across synaptic cleft is primarily a chemical event mediated by neurotransmitters such as acetylcholine \[(Acl)\] \[\gamma -\]amino butyric acid\[(GABA)\], nor-epinephrine and seratonin.
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