One function of the alveoli is to filter out dirt and pollen before it reaches the lung.

Question

Quizplus · Accepted Answer

The alveoli are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream, not filtering out dirt and pollen. The respiratory system has other structures such as the nasal passages and trachea that are responsible for filtering out dust, dirt, and other particles before they reach the lungs.

One Function of the Alveoli Is to Filter Out Dirt