mamm/sir plzz help.......................................

Asked by  | 2nd Dec, 2008, 03:49: PM

Expert Answer:

The inner surface of lungs show the presence of large number of small balloon-like structures like alveoli. These provide a surface where the exchange of gases can take place.  The walls of the alveoli contain an extensive network of blood vessels.

Answered by  | 2nd Dec, 2008, 11:05: PM

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