Upper airway consists of which structure?

• A. Nasopharynx
• B. Trachea
• C. Bronchi
• D. Alveoli

Answer: (A)

The upper airway comprises the passages that conduct and condition air before it reaches the lungs, including the nasal cavity and the pharynx. The nasopharynx sits directly behind the nasal cavity and is part of this region, helping to route air and contribute to filtration and humidity. The other structures—trachea, bronchi, and alveoli—lie lower in the respiratory tract: the trachea conducts air from the larynx downward, the bronchi branch into smaller airways, and the alveoli are the sites of gas exchange. So, the nasopharynx is the structure that belongs to the upper airway.