Assertion: lung's alveoli | /r/HasProperty | responsible for gas exchange
Facets:
Source sentences:
text: An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange.
text: An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange.
text: An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange.
text: An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange.