''The human lungs are designed to have maximum surface area for exchange of gases''.Explain with three points.
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Explanation:
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.
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it is so as the alveoli is circular in shape and there are millions of alveoli in each lung
this increasing the surface area of gaseous exchange
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