The upper respiratory tract refers to structures that are outside the chest cavity.

Name: The upper respiratory tract refers to structures that are outside the chest cavity.
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The upper respiratory tract includes structures such as the nasal cavity, pharynx, larynx, and trachea, all of which are located outside of the chest cavity (which contains the lungs, bronchi, and other lower respiratory structures).

The Upper Respiratory Tract Refers to Structures That Are Outside