Question 26

Drinking alcohol enhances activity at Gamma-aminobutyric acid (GABA) receptors.

Alcohol has a calming effect primarily because it enhances the activity of GABA receptors in the brain, which are responsible for inhibitory neurotransmission and promote relaxation and sedation.

A) Gamma-aminobutyric acid (GABA)

This option is correct as GABA is the main inhibitory neurotransmitter in the central nervous system. Alcohol increases GABA's effects, leading to a calming and sedative effect on the brain, which explains the tranquilizing nature of alcohol consumption.

B) Glutamate

Glutamate is the primary excitatory neurotransmitter in the brain. Instead of calming, enhancing glutamate activity would lead to increased neuronal activity and excitability, which is contrary to the calming effects associated with alcohol.

C) Dopamine

While dopamine is involved in the reward pathways and can affect mood, it is primarily associated with pleasure and motivation rather than the calming effects that alcohol induces. Therefore, it does not directly contribute to the calming effect of alcohol.

D) Acetylcholine

Acetylcholine plays a significant role in muscle activation and various brain functions, including attention and arousal. Enhancing acetylcholine activity would not produce the calming effects sought after in alcohol consumption, making this option incorrect.

E) Serotonin

Serotonin is linked to mood regulation and feelings of well-being; however, it does not directly mediate the calming effects of alcohol. While alcohol may indirectly influence serotonin levels, it is not the primary neurotransmitter responsible for the calming effect.

Conclusion

Gamma-aminobutyric acid (GABA) is definitively the correct answer, as it is the key neurotransmitter that facilitates the sedative effects of alcohol by inhibiting neural activity. All other options relate to different neurotransmitter functions that do not primarily produce the calming effects that characterize alcohol consumption.