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1. increase in the caliber of blood vessels.
2. a state of increased caliber of blood vessels. Extreme, abnormal vasodilation is called angiectasis. adj., adj vasodi´lative.
Widening of the lumen of blood vessels.
vasodilatation/vaso·di·la·ta·tion/ (-dĭ″lah-ta´shun) vasodilation.
Increase in the caliber of a blood vessel due to relaxation of smooth muscle fibers in the tunica media. This increases blood flow but decreases systemic vascular resistance.
vasodilatationWidening of blood vessels as a result of relaxation of the muscles in the walls. This allows a greater volume of blood to pass through in a given time. Compare VASOCONSTRICTION.
vasodilatationwidening of the lumen of a blood vessel, due to relaxation of the smooth muscle in its wall, mediated by neural (autonomic) control, local or blood-borne chemical factors, or rise in temperature. Syn vasodilation.
a state of increased caliber of blood vessels.