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Bitmap Image  |  1995-06-29  |  14.5 KB  |  226x190  |  8-bit (43 colors)  |  [TEXT/LMAN]
   ocr: Alveolus A TINY thin-walled sac in the lungs LUNGS contain millions of - tiny sacs called: alveoli. They give the lungs a huge surface area for gaseous exchange.