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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.
Last Revised: May 28, 2013
Author: Healthwise Staff
Medical Review: E. Gregory Thompson, MD - Internal Medicine & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
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