Assertion: testicular vein's valve | /r/CapableOf | keep the blood
Facets:
Source sentences:
text: With such notable exceptions as the portal system, most veins contain valves, formed by pouches in their inner coats, that keep the blood from flowing backward.
text: The veins in your body are less muscular than arteries and are equipped with valves that keep blood flowing in the right direction, toward your heart.
text: Varicose veins develop spontaneously, and are usually attributed to a hereditary weakness of the vein; the valves in the vein that keep the blood