Which neurotransmitter is primarily inhibitory in the brain and helps regulate anxiety?

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Multiple Choice

Which neurotransmitter is primarily inhibitory in the brain and helps regulate anxiety?

GABA is the brain’s main braking system. As gamma-aminobutyric acid, it greatly dampens neuronal activity across many circuits. When GABA binds to its receptors, especially the GABA-A receptor, chloride ions rush into the neuron, making the cell membrane more negative and harder to fire. This hyperpolarization reduces the excitability of neural networks involved in anxiety, helping to calm exaggerated or excessive responses. Medications that boost GABA signaling, like benzodiazepines, are effective anxiolytics precisely because they enhance this inhibitory effect. Dopamine, while critical for reward and motivation, often has excitatory roles in many pathways. Serotonin has diverse actions depending on receptor subtype, not a single primary inhibitory function. Norepinephrine tends to increase arousal and vigilance. While these systems influence anxiety, none act as the brain’s main inhibitory brake in the way GABA does.

GABA is the brain’s main braking system. As gamma-aminobutyric acid, it greatly dampens neuronal activity across many circuits. When GABA binds to its receptors, especially the GABA-A receptor, chloride ions rush into the neuron, making the cell membrane more negative and harder to fire. This hyperpolarization reduces the excitability of neural networks involved in anxiety, helping to calm exaggerated or excessive responses. Medications that boost GABA signaling, like benzodiazepines, are effective anxiolytics precisely because they enhance this inhibitory effect.

Dopamine, while critical for reward and motivation, often has excitatory roles in many pathways. Serotonin has diverse actions depending on receptor subtype, not a single primary inhibitory function. Norepinephrine tends to increase arousal and vigilance. While these systems influence anxiety, none act as the brain’s main inhibitory brake in the way GABA does.

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