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Respiratory system

The upper respiratory tract (upper airway) consists of the nose, mouth, sinuses, and throat. The lower respiratory tract consists of the trachea, bronchial tubes, and the structures inside the lungs.

Primary Medical Reviewer Caroline S. Rhoads, MD
- Internal Medicine
Specialist Medical Reviewer W. David Colby IV, MSc, MD, FRCPC
- Infectious Disease
Last Updated August 2, 2007

WebMD Medical Reference from Healthwise

Last Updated: August 02, 2007
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