Assertion: vein's way valve | /r/CapableOf | prevent blood
Facets:
Source sentences:
text: The tunica intima of a deep vein usually has a one-way valve to prevent blood from flowing backward.
text: The tunica intima of a deep vein usually has a one-way valve to prevent blood from flowing backward.
text: To facilitate the movement of blood, some veins contain many one-way valves that prevent blood from flowing away from the heart.
text: The one-way valves in deep veins prevent blood from flowing backward, and the muscles surrounding the deep veins compress them, helping force the blood toward the heart, just as squeezing a toothpaste tube ejects toothpaste.