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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.
CENTRAL NERVOUS SYSTEM. Alcohol is a depressant of the CNS, meaning it slows activity down. Many people think that alcohol is a pick-me-up experience because, initially, when people begin to drink, it causes them to become more animated and less reserved. But the opposite occurs as they continue to drink and more alcohol enters the brain.