The upper respiratory structures include the nose, the larynx, and the __________.

• A. trachea
• B. bronchi
• C. pharynx
• D. alveoli

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the anatomy of the upper respiratory system. The upper respiratory structures are responsible for the initial stages of air intake and preparation for gas exchange. These include the nose, pharynx, and larynx.
2. Step 2: Recall the function of the pharynx. The pharynx is a muscular tube that serves as a passageway for both air (to the respiratory system) and food (to the digestive system). It connects the nasal cavity and mouth to the larynx and esophagus.
3. Step 3: Differentiate between upper and lower respiratory structures. The trachea, bronchi, and alveoli are part of the lower respiratory system, which is involved in the conduction and exchange of gases.
4. Step 4: Match the correct structure to the blank. Based on the anatomical classification, the pharynx is part of the upper respiratory system, while the trachea, bronchi, and alveoli belong to the lower respiratory system.
5. Step 5: Confirm the correct answer. The pharynx completes the list of upper respiratory structures alongside the nose and larynx.