In the central nervous system, neurotransmitters play crucial roles in regulating neuronal activity. Which of the following statements accurately describes the primary functions of GABA and glutamate?
Show answer and explanation
The answer
Correct answer: B. GABA is the main inhibitory neurotransmitter, while glutamate is the main excitatory neurotransmitter.
Tested concept: GABA and glutamate
Explanation
GABA (gamma-aminobutyric acid) is the principal inhibitory neurotransmitter in the central nervous system, reducing neuronal excitability. Glutamate, conversely, is the primary excitatory neurotransmitter, increasing the likelihood of neuronal firing. Distractor 1 incorrectly reverses their roles. Distractor 2 assigns incorrect primary functions to both neurotransmitters. Distractor 3 incorrectly classifies GABA as excitatory and misrepresents their relative effects.
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