STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Capillary and red blood cell. Transmission electron micrograph (TEM) of a section through a capillary showing a single red blood cell (red) almost filling the lumen (inner space) of the capillary. Capillaries are the smallest blood vessels in the body, only a few micrometres across, just large enough for the passage of red blood cells. The capillary lining consists of endothelial cells. A blue basement membrane surrounds the capillary. Magnification: x4000 when printed 10 centimetres wide.
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