Acetylcholine as neurotransmitter – Physiology MCQ

Which of the following neurons do not have acetylcholine as the neurotransmitter?
A. Preganglionic sympathetic neurons
B. Postganglionic sympathetic neurons
C. Preganglionic parasympathetic neurons
D. Neurons innervating sweat glands

Correct answer: B. Postganglionic sympathetic neurons

Explanation:

Preganglionic neurons
- Sympathetic – acetylcholine
- Parasympathetic – acetylcholine
Postganglionic neurons
- Sympathetic – norepinephrine
- Parasympathetic – acetylcholine
Exception: In sympathetic neurons innervating eccrine sweat glands, acetylcholine is the neurotransmitter.

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