Assertion: vasodilator | /r/CapableOf | act on smooth muscle of arteries
Facets:
value: to relax their walls
type: PURPOSE
value: directly
type: MANNER
Source sentences:
text: Vasodilators act directly on the smooth muscle of arteries to relax their walls so blood can move more easily through them; they are only used in hypertensive emergencies or when other drugs have failed, and even so are rarely given alone.