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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.
The circulatory system includes the heart; a system of vessels called arteries, veins, and capillaries; and blood. Blood is pumped by the heart through these vessels, causing âcirculationâ throughout the body. You may have read about some positive effects that alcohol can have on this system. Studies in adults have shown that a glass of alcohol (beer, wine, or distilled spirits) each day can help heart function.