Respiratory system

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Illustration of the respiratory system

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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.

Medical Review:Caroline S. Rhoads, MD - Internal Medicine
W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
Last Updated: 08/02/2007

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