Assertion: respiratory tract | /r/HasProperty | an organ system
Facets:
value: first of all
type: DEGREE
Source sentences:
text: So first of all, the respiratory tract as a whole is an organ system that's composed of the lungs and the airways.
text: They have an important role in the immune system since the respiratory tract is one of the organ systems with intensive and repeated interaction with the environment (the other is the digestive system).