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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 often incorrectly classified as a stimulant or upper. Alcohol is in fact a tranquilliser which depresses the central nervous system. The short term physical effects depend on the blood-alcohol level. It ranges from mild mood changes to complete loss of coordination, vision, balance and speech. These effects usually wear off in a matter of hours after a person stops drinking. Larger amounts of blood alcohol can impair brain functioning and eventually cause unconsciousness. An extreme overdose, when the blood-alcohol level is higher than 0,50, can be fatal.