<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A state of increased caliber of the blood vessels.</n0:def-definition><n0:def-source>FDA</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Vasodilation involves widening of a blood vessel lumen due to smooth muscle relaxation in the vessel wall and leads to increased blood flow.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>