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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.
But how alcohol effects blood vessels is much more complex but it seems it's due to it's effects on the functioning of the nervous system. I'll have to quote rather than try and explain because i can't say i totally understand extactly how this all works: Alcohol is a central nervous system depressant.