Assertion: lung | /r/HasProperty | hollow
Facets:
value: in order to retain air
type: PURPOSE
Source sentences:
text: By the late twelfth century, Master Nicolaus summarized well the qualities of the lung: it was built to "withstand the warmth of the heart," its soft, spongy tissue facilitated motion, it was hollow in order to retain air "for cooling the heart and renewing the vital spirits," and it exhibited a twofold motion that further facilitated its role as "the flail of the heart.