MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY
Termination of the respiratory tree or passages within the lung. A terminal bronchiole is seen to branch giving rise to respiratory bronchioles then the alveolar ducts and ending in clusters of very thin-walled alveoli. Gas exchange occurs between air in the alveoli and capillaries running in their walls. The margin to the right (blue stained) is the pleural surface of the lung. Magnification x40 printed at 10cm wide.
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