CMEABG / UCBL1, ISM / SCIENCE PHOTO LIBRARY CMEABG / UCBL1, ISM / SCIENCE PHOTO LIBRARY
Lung alveoli and red blood cells. Coloured transmission electron micrograph (TEM) of lung alveoli (blue) surrounded by blood capillaries (pink) containing red blood cells (red). Alveoli are the site of gaseous exchange in the lungs, where oxygen is taken up by the red blood cells and carbon dioxide released for exhalation out of the body. Magnification: x2100 when printed at 10cm wide.
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