Assertion: valve's cusp | /r/CapableOf | keep the blood
Facets:
Source sentences:
text: The word tricuspid literally refers to the way the valve is constructed; the tricuspid valve is constructed of three cusps or flaps, which keep the blood from flowing backward into the right atrium, and also which allow deoxygenated blood to flow from the right atrium into the right ventricle of the hearts of mammals.