| http://www.w3.org/ns/prov#value | - And here At intoxicating levels, alcohol is a vasodilator (it causes blood vessels to relax and widen), but at even higher levels, it becomes a vasoconstrictor, shrinking the vessels and increasing blood pressure, exacerbating such conditions as migraine headaches and frostbite. http://www.scientificamerican.com/artic ... fects-of-a
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