Which of the following neurotransmitters works outside the brain?
Correct answer: C. Acetylcholine
- A. Dopamine
- B. Serotonin
- C. Acetylcholine
- D. Melatonin
Explanation
Acetylcholine is the transmitter at neuromuscular junctions and in much of the autonomic nervous system, so it works widely outside the brain as well as inside it. Dopamine and serotonin act mainly as brain neurotransmitters, and melatonin is a hormone of the pineal gland rather than a neurotransmitter.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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