Award Best Answer. Once your question has been posted for at least 1 hour and has at least one answer, click on 'Award Best Answer' button next to your chosen answer. 1  Upload failed. 2  Please upload a file larger than 100x100 pixels. 3  We are experiencing some problems, please try again.
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.
One drink of either red wine or alcohol slightly benefits the heart and blood vessels, but the positive effects on specific biological markers disappear with two drinks, say researchers at the Peter Munk Cardiac Centre of the Toronto General Hospital.