Which of the following neurotransmitters is most likely to produce an inhibitory postsynaptic potential (IPSP) in the central nervous system?
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Correct answer: GABA
GABA is a major inhibitory neurotransmitter in the adult CNS; its binding typically opens Cl⁻ channels (or K⁺ channels), causing hyperpolarization and an inhibitory postsynaptic potential.
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