Write brief account on alveoli!
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When air enters through our nose then it goes to lungs by wind pipe.The wind pipe divides into bronchi and enter each lung.In singular it is bronchioles.At the end of bronchioles there is a air sacs connected with a blood vessel.This air sacs is known as alveoli.
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Alveoli are tiny air scas present in the bronchioles where the exhange of gases takes place
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