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(D) Acetylcholinesterase is an enzyme present at the synaptic cleft.After the transmission of a nerve impulse,the neurotransmitter acetylcholine is re

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Acetylcholinesterase

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(D) Acetylcholinesterase is an enzyme present at the synaptic cleft.After the transmission of a nerve impulse,the neurotransmitter acetylcholine is released into the synaptic cleft to propagate the signal.To prevent continuous stimulation and allow the synapse to reset,the enzyme acetylcholinesterase hydrolyzes acetylcholine into choline and acetic acid.This action terminates the signal,allowing the postsynaptic membrane to return to its resting state so it can receive another impulse.

After the transmission of one impulse from the synapse,it cannot transmit another impulse immediately because one of the following chemicals is active there:

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