What is the parasympathetic neurotransmitter at target organs and the common receptor type?

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Multiple Choice

What is the parasympathetic neurotransmitter at target organs and the common receptor type?

Explanation:
In parasympathetic signaling, acetylcholine is released onto the target organ. The receptors on those effectors are muscarinic acetylcholine receptors, which are G-protein-coupled receptors. This contrasts with nicotinic receptors, which are ion channels found at autonomic ganglia and the neuromuscular junction, not typically on parasympathetic target organs. Norepinephrine on alpha receptors is the usual transmitter-receptor pairing for the sympathetic system, not the parasympathetic one. So acetylcholine with muscarinic receptors best describes parasympathetic neurotransmission at target organs.

In parasympathetic signaling, acetylcholine is released onto the target organ. The receptors on those effectors are muscarinic acetylcholine receptors, which are G-protein-coupled receptors. This contrasts with nicotinic receptors, which are ion channels found at autonomic ganglia and the neuromuscular junction, not typically on parasympathetic target organs. Norepinephrine on alpha receptors is the usual transmitter-receptor pairing for the sympathetic system, not the parasympathetic one. So acetylcholine with muscarinic receptors best describes parasympathetic neurotransmission at target organs.

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