Autonomic neurotransmission — FRCA Primary MCQ

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ModeratePhysiologyAutonomic neurotransmissionFRCA Primary

A patient has tachycardia and dry mouth after atropine during induction. Which neurotransmitter normally acts at parasympathetic postganglionic muscarinic receptors?

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Correct answer: C — Acetylcholine

Acetylcholine is released by parasympathetic postganglionic neurones and acts at muscarinic receptors in target organs. Noradrenaline is the usual sympathetic postganglionic neurotransmitter, with exceptions such as sweat glands. Dopamine and adrenaline have specific roles but are not the main parasympathetic effector transmitter. Atropine blocks these muscarinic acetylcholine effects.

Reference: Ganong Review of Medical Physiology; Primary FRCA physiology texts