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50.2 MB (50.0 MB compressed)
4835 x 3626 pixels
40.9 x 30.7 cm ⏐ 16.1 x 12.1 in (300dpi)
HARVINDER SINGH / SCIENCE PHOTO LIBRARY HARVINDER SINGH / SCIENCE PHOTO LIBRARY
Alveoli. Illustration of alveoli in the lung showing tiny air tubes (bronchioles) leading to groups of balloon-like sacs called alveoli. It is in each alveolus that gaseous exchange takes place during breathing (respiration).
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