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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.
Alcohol is a central nervous depressant. In short, alcohol depresses, or slows down the bodyâs central nervous system (CNS). As oneâs blood alcohol level goes up, the effects of the depressant become more pronounced. As intoxication increases, cognitive processing slows and motor coordination decreases. This is because the brain is part of the CNS, and is affected by alcohol.