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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.
It affects the nerves that pass messages around the body by slowing them down and the more you drink the greater the effect. The reason people often get more lively when they've had a drink is that alcohol affects parts of the brain responsible for self-control. Your reactions also slow down, and you may become uncoordinated or unsteady on your feet. Your speech may get slurred and you may start seeing double.