PROF. P. MOTTA / DEPT. OF ANATOMY / UNIVERSITY "LA SAPIENZA", ROME / SCIENCE PHOTO LIBRARY PROF. P. MOTTA / DEPT. OF ANATOMY / UNIVERSITY "LA SAPIENZA", ROME / SCIENCE PHOTO LIBRARY
Lung tissue. False-colour scanning electron micrograph of a section of lung tissue. The image shows many alveolar ducts (larger dark areas) together with many alveoli (smaller round dark areas). Two alveolar ducts are clearly visible (bottom centre and top right) as sectioned long tubules. The alveoli are separated by a porous membrane known as the interalveolar septum. The tiny openings in the interalveolar septum are sectioned capillaries and it is in this intricate network of capillaries that the exchange between carbon dioxide and oxygen takes place. Magnification: x70 at 6x7cm size.
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