In what order do the listed structures fill with air during inspiration?

• A. Nose, pharynx, larynx, trachea, bronchi, lungs
• B. Pharynx, larynx, trachea, bronchi, nose, lungs
• C. Trachea, bronchi, larynx, pharynx, lungs, nose
• D. Bronchi, lungs, trachea, larynx, nose, pharynx

Answer: (A)

The correct sequence of air filling during inspiration starts with the nose, where air enters the respiratory system. The nasal passages warm, humidify, and filter the incoming air. From the nose, air travels to the pharynx, which is the passageway that connects the nasal cavity to the larynx.

Next, air moves through the larynx, which contains the vocal cords and serves as a gateway to the trachea. Following the larynx, air flows into the trachea, the windpipe that provides a clear path for air to enter the lungs. The trachea subsequently divides into the bronchi, which are the main passageways leading to each lung. Finally, air reaches the lungs where gas exchange occurs.

This sequence reflects the anatomical pathway that air follows during inhalation, ensuring that air is appropriately filtered, warmed, and moistened before reaching the lungs for efficient gas exchange.