Assertion: circulatory system's vein | /r/HasProperty | passive conduit
Facets:
value: for carrying the blood
type: PURPOSE
Source sentences:
text: The veins are a passive conduit for carrying the blood (controlled by the initial compression and contraction of the heart, arteries and arterioles) emphasizing the need for unidirectional valves inside of the veins in order to prevent backflow of blood.