Question

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

Answer 1

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=> lungs are flexible structures and internally contain a large number of air sacs or alveoli. Alveoli are also flexible with thin membrane
. Alveoli increase many times the surface area for the exchange of gases so the lungs are designed in human beings to maximize the area for exchange of gases.

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Answer 2

Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli. The oxygen from the breath, diffuses into the blood and CO2 from the blood brought from the body, diffuses out into the air.