Assertion: endocardium's cell | /r/CapableOf | line the body cavity of embryos
Facets:
Source sentences:
text: is thatis (anatomy|cardiology) a serous membrane that surrounds the heart allowing it to contract whileis (biology) a membrane of flat cells that lines the body cavity of embryos and forms the squamous cells of the peritoneum, pericardium, and pleura.
text: Mesothelium the layer of flat cells lining the body cavity of the embryo; in the adult, it forms the simple squamous epithelium that covers the true serous membranes of the body.