51.6 MB (4.1 MB compressed)
5131 x 3514 pixels
43.4 x 29.7 cm ⏐ 17.1 x 11.7 in (300dpi)
DR YORGOS NIKAS / SCIENCE PHOTO LIBRARY DR YORGOS NIKAS / SCIENCE PHOTO LIBRARY
Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot, also known as a thrombus. Red blood cells (erythrocytes) are seen trapped in a web of yellow fibrin threads made of an insoluble protein. Small platelets (green) have also become enmeshed in the clot. When activated, platelets clump together and release chemical factors into the blood. These factors cause fibrin threads to form. A clot forms when a blood vessel is injured or diseased. It is essential for stopping bleeding. A clot that forms inside a blood vessel, however, may lead to a heart attack if it blocks a heart artery. Magnification: x2,200 at 5x7cm size. Mag; 7,500 at 10x8 inch size.
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