What functions do the alveoli serve in the lungs?
A) They ensure that air flows completely through the lungs.
B) They prevent dust and pollen from entering the lungs.
C) They help to expand and contract the lungs.
D) They allow for the exchange of carbon dioxide and oxygen.

Question

Quizplus · Accepted Answer

Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled from the body.

What Functions Do the Alveoli Serve in the Lungs