The answer to this question would be: proceed through the trachea, bronchi, and then bronchioles.
After going pass the oropharynx the air will be going to trachea, bronchi, bronchioles and will end in the alveolus. In alveolus, the oxygen from the air will diffuse to the blood while carbon dioxide will diffuse to the alveolus. The carbon dioxide is going out of the lungs when doing expiration.
