Parasympathetic postganglionic neurons release the neurotransmitter ; sympathetic postganglionic neurons release the neurotransmitter .

Parasympathetic post ganglionic neurons release the neurotransmitter acetyl choline and sympathetic post ganglionic neurons release the neuro transmitter nor epinephrine.

Explanation:

The post ganglionic fibers that are present in sympathetic division are adrenergic and release nor adrenaline hormone as a neuro transmitter and post ganglionic fibers in parasympathetic division are called as cholinergic as they release acetylcholine as a neurotransmitter.

The post ganglionic neurons release acetylcholine and thus activates muscarinic receptors and the sympathetic nervous system release acetylcholine that activates nicotinic acetylcholine receptors that are present in post ganglionic neurons.

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