Final answer:
Alcohol works as a central nervous system depressant by suppressing central nervous system activity through its interaction with the GABA neurotransmitter system.
Step-by-step explanation:
Alcohol works as a central nervous system depressant by suppressing central nervous system activity. It acts as an agonist of the gamma-aminobutyric acid (GABA) neurotransmitter system, which has a calming effect on the brain. This is why alcohol can cause sedation, poor coordination, and impaired judgment.