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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 depresses the central nervous system causing many short term effects like slurred speech, blurred vision, weakened muscles, decreased reaction time and impaired memory. When alcohol is consumed excessively it can cause cell damage in the central nervous system creating a condition known as neuropathy.