The upper respiratory system includes the nose, nasal cavity, pharynx (throat), and larynx (voice box). One of the ways air enters the respiratory system is through the nostrils of the nose where it is then filtered, humidified and warmed inside the nasal cavity. It then passes through the pharynx (a passageway for both air and food) and continues to the larynx, another air passageway. The larynx also functions to prevent food from entering into the lower respiratory tract.
The Upper Respiratory System
Updated November 26, 2008
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Upper Respiratory System
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