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Best Answer: Alcohol or ethanol affects the human nervous system by inhibiting signals between the brain, nerve endings and spinal cord. When people drink, their bloodstream absorbs the alcohol and nervous system functions slow down dramatically--this is the buzz or numbness people commonly feel after drinking.
However, the early effects of intoxication sometimes give the false impression that it is a stiumulant. People lose their inhibitions while having a light alcohol intoxication; making it seem like a stimulant. Alcohol is a central nervous system (CNS) depressant. Most people don't completely understand what a depressant is. Simply put it slows down the CNS by acting on the brains principal inhibitory neurotransmitter called GABA. As a result of activating GABA neuronal firing decreases leading to reduced activity in the brain.