The Conducting zone reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Conducting zone

The conducting zone of the respiratory system is made up of the trachea, bronchi, bronchiles, and terminal bronchioles.

Functions

1. Low resistance pathway for airflow
2. Defence
3. Warms and moistens air
4. Phonates