What is the correct sequence of air passage into the lungs?

The correct sequence of air passage into the lungs begins with inhalation through the nose or mouth, which leads to the nasopharynx. The nasopharynx serves as a passageway for air and connects to the oropharynx. The air then moves from the oropharynx to the larynx, which is crucial for protecting the airway and is involved in phonation. Following the larynx, air enters the trachea, a major airway that conducts air down into the bronchial tubes leading to the lungs.

This sequence is significant because it outlines the proper pathway air takes for oxygen to reach the lungs effectively. Each part of this pathway plays specific roles in filtering, humidifying, and regulating the temperature of the incoming air, essential for maintaining respiratory health.

In other sequences, such as the one that begins with the nasopharynx but skips over the mouth and oropharynx, or one that does not include these initial passages, the essential functions of air conditioning and protection would be overlooked, highlighting the importance of each segment in the respiratory system.