Which of the following acts as an inhibitory neurotransmitter in the brain?
- A. Acetylcholine
- B. Noradrenaline
- C. Dopamine
- D. GABA
Explanation
GABA, gamma aminobutyric acid, hyperpolarises the postsynaptic membrane and calms neural activity, and many sedatives enhance its action. Acetylcholine and noradrenaline are generally excitatory at the synapses where they are best known.
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