What is the function of alveoli?

Correct option is B

The function of alveoli is to provide a surface where exchange of gases takes place.
· The tiny sacs found in the lungs, which exchange carbon dioxide and oxygen are known as alveoli.
· They are the tiniest compositions in the respiratory system.
· The alignment of alveoli takes place in the form of clusters all through the lungs.
· The walls are very thin, which permits oxygen and carbon dioxide to pass readily between the capillaries and alveoli.
· Functions of Alveoli:
1. It is the composition from where the blood and lungs exchange carbon dioxide and oxygen at the time of breathing in and out.
2. The oxygen breathed in passes via the alveoli and into the blood and mediates to the tissues all through the body.
3. The carbon dioxide passes through the blood from the tissues of the body and passes via the alveoli to be breathed out.