Assertion: valve | /r/CapableOf | close at the end of atrial contraction
Facets:
value: to prevent blood
type: PURPOSE
Source sentences:
text: As the pressure increases above that of the left ventricle, the valve opens allowing blood to flow into the left ventricle during diastole (early rapid filling and atrial contraction), and closes at the end of atrial contraction to prevent blood flowing back i.e., during ventricular systole.