How are the alveoli designed to increase the exchange of gases

1.	How are the alveoli designed to increase the exchange of gases
Answer» Alveoli are small pouches or sacs . About 150 million alveoli occur inside each lung . The whole surface of an aveolus functions as respiratory surface . As there are about 150 million alveoli in each lung a very large area of respiratory surface becomes available about 80 m2 for exchange of gases

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