Which of the following is not located in the lower airway?

The laryngopharynx is considered part of the upper airway, which includes structures such as the nasal passages, mouth, and throat. Its role is primarily associated with the passage of air and food, linking the oral cavity and esophagus to the larynx. In contrast, the larynx, trachea, and bronchi are all components of the lower airway, which are more directly involved in conducting air to the lungs and facilitating gas exchange. The larynx serves as the voice box, the trachea branches into the bronchi that lead into the lungs, indicating that these structures are essential parts of the respiratory system functioning below the pharynx level.