"the human lungs are designed to have maximum surface area for exchange of gases" explain
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The exchange of gases can take place on the surface which is provided by the alveoli. The walls of the alveoli are supplied with an extensive network of blood vessels. - So lungs maximize the area for a gaseous exchange through the presence of large numbers of alveoli which are richly supplied with blood.
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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 thealveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli.
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