What is the primary neurotransmitter of the parasympathetic nervous system?

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Multiple Choice

What is the primary neurotransmitter of the parasympathetic nervous system?

Explanation:
Acetylcholine is the main transmitter of the parasympathetic nervous system. It is released at both the preganglionic and postganglionic synapses, acting in the ganglia on nicotinic receptors and on target organs on muscarinic receptors. This signaling produces rest-and-digest effects such as slowing the heart, increasing gut motility, bronchoconstriction, and pupil constriction. Dopamine is a key CNS transmitter and isn’t the primary autonomic transmitter. Norepinephrine drives most sympathetic postganglionic signaling, not parasympathetic. GABA is a major inhibitory neurotransmitter in the CNS and isn’t used as the main autonomic transmitter.

Acetylcholine is the main transmitter of the parasympathetic nervous system. It is released at both the preganglionic and postganglionic synapses, acting in the ganglia on nicotinic receptors and on target organs on muscarinic receptors. This signaling produces rest-and-digest effects such as slowing the heart, increasing gut motility, bronchoconstriction, and pupil constriction. Dopamine is a key CNS transmitter and isn’t the primary autonomic transmitter. Norepinephrine drives most sympathetic postganglionic signaling, not parasympathetic. GABA is a major inhibitory neurotransmitter in the CNS and isn’t used as the main autonomic transmitter.

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