Capillary, TEM

Capillary, TEM

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Credit: MICROSCAPE/SCIENCE PHOTO LIBRARY

Caption: Capillary. Transmission electron micrograph (TEM) of a section through a capillary, showing two red blood cells (erythrocytes, black) in its interior. Capillaries are the smallest diameter blood vessels (5-8 micrometres) and are just wide enough for red blood cells to pass along them. Their very thin walls are made of endothelial cells, across which gases, nutrients, fluids and cells may pass selectively in either direction. External to the endothelium, most capillaries have another layer of cells called pericytes that may be supportive (fibroblasts) or contractile (myofibroblasts). Magnification: x5,000 when printed 10 centimetres wide.

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Keywords: biological, biology, black and white, black-and-white, blood vessel, capillary, cell, cell biology, cells, circulatory system, connective tissue, contractile, cytological, cytology, endothelial, endothelium, erythrocyte, fibroblast, fibroblasts, histological, histology, layer, layers, lumen, monochrome, myofibroblast, myofibroblasts, organelle, organelles, red blood cell, section, sectioned, structure, system, tem, transmission electron micrograph, transmission electron microscope, vascular system, vessel, wall

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