28.7 MB (2.2 MB compressed)
3542 x 2835 pixels
30.0 x 23.9 cm ⏐ 11.8 x 9.4 in (300dpi)
STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Activated platelet. Coloured scanning electron micrograph (SEM) of an activated blood platelet. Platelet cells (thrombocytes) are formed in the bone marrow and circulate in the blood in large numbers. In an unactivated state they are round/oval, whereas this activated platelet has developed extensions from the cell wall known as pseudopodia. Platelets plug defects in the walls of blood vessels and are involved in clotting. They also release serotonin which constricts blood vessels. Magnification: x12,200 at 6x7 cm size. Magnification: x40,000 at 9.5x7.5" size.
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