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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