What is the correct order of air passage from inhalation to gas exchange?

The correct sequence for air passage from inhalation to gas exchange is nasal cavity, trachea, bronchi, and finally alveoli.

Air enters the respiratory system through the nasal cavity, where it is filtered, warmed, and humidified. From the nasal cavity, air travels down the trachea, which is the main airway leading to the lungs. The trachea then divides into the left and right bronchi, which branch off into smaller bronchioles within the lungs.

Ultimately, the bronchioles lead to the alveoli, the tiny air sacs where gas exchange occurs. In the alveoli, oxygen is exchanged for carbon dioxide in the blood, allowing for the distribution of oxygen throughout the body and the removal of carbon dioxide. This pathway reflects the structured design of the respiratory system, optimizing the process of inhalation and ensuring efficient gas exchange.