Assertion: heart valve | /r/CapableOf | prevent back flow of blood
Facets:
Source sentences:
text: It also prevents the back flow of blood as it is pumped from the right atrium to the right ventricle.
text: When closed, it prevents the back flow of blood as it is pumped from the right ventricle to the pulmonary artery.
text: When closed, it allows blood from the left atrium to fill the left ventricle and prevents the back flow of blood that is pumped from the left ventricle to the aorta.