LM of a cross section through alveoli in the lung

LM of a cross section through alveoli in the lung

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Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Lung alveoli. Light micrograph of a cross section through lung tissue showing alveoli. Making up the frame (spongy appearance) are tiny air sacs called alveoli. The alveolar walls (pink) are lined with a one-cell thick layer of epithelium. Breathed in air diffuses through the epithelium to a rich network of capillaries in the walls. This is where exchange of gases (oxygen and carbon dioxide) takes place. Oxygen will be carried by the capillary blood to the heart. At the same time carbon dioxide will diffuse out of the blood into the lung and will be breathed out. Magnification: x64 at 35mm size.

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Keywords: alveolus, anatomy, capillary, human body, light micrograph, lung, lungs, respiratory system

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