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Acetylcholine is a neurotransmitter in brain,ganglion's of autonomic nervous system, and at post ganglionic nerve ending of parasympathetic fibers.It is also released at motor end plate. After it's release, in synaptic cleft, it transmits the nerve impulse to next target. Within fewmilliseconds it is destroyed by the enzyme 'acetylcholinesterase'. In case of nor-adrenaline, there is 're-uptake' by neurons.

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Q: Why doesn't acetylcholine remain on on the postsynaptic neuron?
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