Assertion: vein's valve | /r/CapableOf | assist unidirectional flow of blood
Facets:
value: toward the heart
type: TRANSITIVE-OBJECT
Source sentences:
text: In addition, many veins of the body, particularly those of the limbs, contain valves that assist the unidirectional flow of blood toward the heart.
text: In addition, many veins of the body, particularly those of the limbs, contain valves that assist the unidirectional flow of blood toward the heart.