Question

How do alveoli help in gas exchange?

Answer 1

Alveoli are site of gas exchange. They are tiny sac-like air chambers at the end of each bronchial inside the lungs. Alveoli are thin walled structure that are surrounded by a network of small blood vessels where the exchange of gases between lungs and blood occurs. The inhaled oxygen present inside the alveoli of lungs goes to blood in the capillaries. The blood in turn passes the carbon dioxide to the alveoli of lungs.