Q12 of 90 Page 113

How are the lungs designed in human beings to maximize the area for exchange of gases?

1. The lungs have several small tubules which terminate into balloon-like structures.


2. These balloons like structures are known as alveoli.


3. These alveoli increase the surface area for the exchange of gases. The alveoli contain an excessive network of blood vessels.


4. Hence, lungs have alveoli that maximizes the area for exchange of gases.


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