Which statement best describes the effect of alcohol on neurotransmitter systems?

• A. It slows brain activity and affects neurotransmitter systems (e.g., GABA).
• B. It speeds up brain activity and increases all neurotransmitter release.
• C. It has no effect on neurotransmitters.
• D. It only affects dopamine.

Answer: (A)

Alcohol changes how neurons communicate by altering neurotransmitter systems, which generally slows brain activity. It enhances GABA, the brain’s main inhibitory signal, making neurons less likely to fire and producing calming, slowed responses. It also dampens excitatory glutamate signaling, further reducing brain function. While it can raise dopamine in reward pathways, that doesn’t mean it increases all neurotransmitter release or speeds up brain activity. So the statement that best fits is that alcohol slows brain activity and affects neurotransmitter systems (for example GABA).