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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 Effects of Alcohol on Blood Vessels. Dr Roberts drinks two glasses of wine. The measurements of the radial pulse wave show how the blood vessel becomes more flexible and thereby reduces stress on the heart. Categories. 1  Personal, social and health education / Healthy lifestyle.  Personal, social and health education / Drugs and alcohol.