Function Of The Airways In The Respiratory System

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Upper airway function and dysfunction in respiration. . The upper airway not only provides a passage for air to be breathed in and out of the lungs, but it also heats, humidifies and filters the air and is involved in cough, swallowing and speech.. Upper respiratory tract This includes the nose, mouth, and the beginning of the trachea the section that takes air in and lets it out . Lower respiratory tract This includes the trachea, the bronchi, broncheoli and the lungs the act of breathing takes place in this part of the system ..Overview of the Respiratory System and Lung and Airway Disorders Learn about from the Merck Manuals Medical Consumer Version. How Lungs Function..