52.3 MB (2.8 MB compressed)
4961 x 3687 pixels
41.9 x 31.2 cm ⏐ 16.5 x 12.3 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Blood clots. Coloured scanning electron micrograph (SEM) of small blood clots (red) in a blood vessel. The clots consist of red blood cells, white blood cells, and platelets, all trapped in a mesh of fibrin. The clotting process is started by the platelets. A blood clot forms naturally in response to damage to a blood vessel, but abnormal blood clots can cause strokes and heart attacks.
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