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2015-06-24T13:59:31+05:30

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There are many small alveoli in our lungs instead of a few bigger ones because,  they would have a much greater surface area for the exchange of oxygen and carbon dioxide. 
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2015-06-24T13:59:37+05:30

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Alveolus are small in size because they helps in filtering of the de oxizanated blood to oxizanated blood
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