An Amino Acid That Operates at Inhibitory Synapses in the Brain

Question

An amino acid that operates at inhibitory synapses in the brain is
A) acetylcholine.
B) epinephrine.
C) endorphin.
D) nitric oxide.
E) GABA.

Accepted Answer

GABA (gamma-aminobutyric acid) is an amino acid that operates at inhibitory synapses in the brain. It is the main inhibitory neurotransmitter in the central nervous system and helps to regulate neuronal excitability. The other options listed are not typically associated with inhibitory synapses in the brain.