A) GABA
B) 5-hydroxy tryptophan
C) Serotonin
D) Glutamine
Correct Answer: A
Solution :
\[\gamma -\]aminobutyric acid (GABA) is the chief inhibitory neurotransmitter in the mammalian central nervous system. It plays the principal role. In reducing neuronal exciptability throughout the nervous system. In humans, GABA is also directly responsible for the regulation of muscle tone.
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