Assertion: lung's sac | /r/MadeOf | alveoli
Facets:
Source sentences:
text: Bronchioles lead to alveolar sacs, which are sacs containing alveoli.
text: These divide into the respiratory bronchioles of the respiratory zone which divide into alveolar ducts that give rise to the alveolar sacs that contain the alveoli, where gas exchange takes place.
text: The respiratory bronchiole gives rise to the alveolar ducts that lead to the alveolar sacs, which contain two or more alveoli.