Assertion: trachea's cartilage ring | /r/AtLocation | the trachea
Facets:
value: to prevent it
type: PURPOSE
Source sentences:
text: The 'c' shaped cartilage rings are present in the trachea to prevent it from collapsing and they keep the trachea open for air to come in and out.
text: The 'c' shaped cartilage rings are present in the trachea to prevent it from collapsing and they keep the trachea open for air to come in and out.