Question

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

Explanation:

Alveoli are tiny air sacs in the lungs. Their main function is to facilitate the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. Mucus production is mainly by goblet cells. Lung protection is a function of the pleura and other tissues. Waste removal (like in the excretory system) and nutrient transport (by blood vessels) are not their primary roles.

Answer:

Exchange of gases