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Why are there many alveoli in the lungs?
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Why are there many alveoli in the lungs?

User Pablo Ramirez
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There is a much greater surface area for the exchange of oxygen and carbon dioxide. 
User Bad Boy
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it is so because :
lungs have to exchange the gases between itself and the surrounding capillaries so for this purpose a larger surface area is required ,, having a large number of alveoli provide large surface area..
User Marvin Zumbado
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