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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.
2 What Is Blood Alcohol Concentration? Your blood alcohol concentration, or BAC, is the amount of alcohol in your blood. For example, if a personâs A is .05% , that means they have 50 milligrams of alcohol in 100 millitres of blood.Each drink you have within a certain timeframe increases your BAC.Alcohol moves through your bloodstream to your whole body. What Is Blood Alcohol Concentration? Your blood alcohol concentration, or BAC, is the amount of alcohol in your blood. For example, if a personâs A is .05% , that means they have 50 milligrams of alcohol in 100 millitres of blood.