Assertion: endocardium's layer | /r/CapableOf | form sac
Facets:
Source sentences:
text: The pericardium has 2 layers—a visceral layer that covers the outside of the heart and a parietal layer that forms a sac around the outside of the pericardial cavity.
text: The partiertal layer forms a sac around the outside of the pericardial cavity.