Assertion: vein | /r/MadeOf | endothelium
Facets:
value: primarily
type: DEGREE
Source sentences:
text: The tunica intima differs from the inner layer of an artery: many veins, particularly in the arms and legs, have valves to prevent backflow of blood, and the elastic membrane lining the artery is absent in the vein, which consists primarily of endothelium and scant connective tissue.