12345678910ECWYMH Scanning electron micrograph of red blood cells and fibrin.121415C13JGP Rudolph Virchow (1821-1902), German pathologist, and one of the most prominent physicians of the 19th century lecturing in a medical amphitheater. Ca. 1890.2Y5AHJ7 Blood clot. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes) trapped in a fibrin mesh. The production of fibrin is triggered by cells called platelets, activated when a blood vessel is damaged. The fibrin binds the various blood cells together, forming a solid structure called a blood clot. A blood clot is a normal response, preventing an excessive loss of blood. However, inappropriate clotting is a major cause of heart attacks and strokes. Magnification x 2000 at 10cm wide.1819
