Question

lo 4.3. what is the function of the alveoli?
removal of waste products
transport of nutrients
protection of the lungs
production of mucus
exchange of gases

Explanation:

Alveoli are tiny air - sacs in the lungs. Their main role is in the respiratory process. Gas exchange (oxygen entering the blood and carbon dioxide leaving the blood) occurs across the thin walls of the alveoli. Removal of waste products (like in the excretory system, e.g., kidneys for urine), transport of nutrients (by blood vessels), protection of the lungs (by structures like the rib cage), and production of mucus (by goblet cells in the respiratory tract) are not the primary functions of alveoli.

Answer:

Exchange of gases