JOHN BURBIDGE / SCIENCE PHOTO LIBRARY JOHN BURBIDGE / SCIENCE PHOTO LIBRARY
Light micrograph of a section of a human lung. The large body at the centre is a pulmonary blood vessel filled with erythrocytes. A rich plexus of fine capillaries surrounds the alveolar sacs (seen here as white spaces) for efficient gaseous exchange. Magnification: x70 at 6x4.5cm size, x44 at 35mm size.
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