The upper respiratory tract (upper airway) consists of the nose, mouth, sinuses, and throat. The lower respiratory tract consists of the trachea, the bronchial tubes, and the structures inside the lungs.
Image copyright 2000 by Nucleus Communications, Inc. All rights reserved. http://www.nucleusinc.com
Medical Review:Michael J. Sexton, MD - Pediatrics
Gary N. Sanden, MS, PhD - CDC Pertussis Program
Gary N. Sanden, MS, PhD - CDC Pertussis Program
Last Updated: January 18, 2006
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