50.8 MB (4.0 MB compressed)
5020 x 3538 pixels
42.4 x 30.0 cm ⏐ 16.7 x 11.8 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Activated platelets. Coloured scanning electron micrograph (SEM) of platelets (thrombocytes, yellow) that have been activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the formation of a fibrin mesh. This mesh traps platelets and red and white blood cells, forming a clot that seals the damaged blood vessel.
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