Source:http://linkedlifedata.com/resource/umls/id/C0042401
MSH: The physiological widening of BLOOD VESSELS by relaxing the underlying VASCULAR SMOOTH MUSCLE.,CSP: state of increased caliber of the blood vessels.,CSP: physiologic dilation of the blood vessels without anatomic change.,GO: An increase in the internal diameter of blood vessels, especially arterioles or capillaries, usually resulting in a decrease in blood pressure. [ISBN:0192800981],NCI: A state of increased caliber of the blood vessels.,NCI: Vasodilation involves widening of a blood vessel lumen due to smooth muscle relaxation in the vessel wall and leads to increased blood flow.