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What happens to acetylcholine after it attaches to a receptor on the postsynaptic cell?​ Select one: a. ​It is metabolized by the postsynaptic cell as a source of energy. b. ​It is reabsorbed intact by the presynaptic cell. c. ​It continues to stimulate the postsynaptic neuron until replaced by another neurotransmitter. d. ​It is broken down into two components.

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Answer: ​It is broken down into two components.

Explanation:

On attachment of acetylcholine to a cholinergic receptor at the postsynaptic cell, an enzyme named CHOLINESTERASE renders the ACETYLCHOLINE inactive by breaking it into two components; thereby preventing it from accumulating at the synaptic gap, and enabling the reestablishment of resting potential at the first neuron.

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