Assertion: vein's valve | /r/CapableOf | help regulate blood flow
Facets:
Source sentences:
text: Aging causes wear and tear on the valves in your veins that help regulate blood flow.
text: Medium and large veins have venous valves, similar to the semilunar valves associated with the heart, that help keep the blood flowing toward the heart.
text: Aging causes wear and tear on the valves in your veins that help regulate blood flow.