Alcohol affects the central nervous system and is classified as a depressant. Under some conditions, however, alcohol can serve as an excitant, while under others it has the effect of a sedative. At high concentrations, alcohol acts increasingly as a depressant, leading to sedation, stupor, and coma. The most important immediate action of alcohol is on the higher functions of the brain: thinking, learning, remembering, and making judgments.
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