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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.
Blood vessels dilate when the arterial walls prevent its muscles from constricting. Blood vessel dilation allows blood to flow more easily through arteries and enables the heart to use less force while pumping which results in lower blood pressure.