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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
If your body contains little amounts of the enzymes it will take longer, however, the amount of enzymes contained in most people does not vary wildly from the average. The rate your body breaks down the alcohol is a rate of 20 to 30 milligrams of alcohol per deciliter of blood, per hour.