BSIP PIR / SCIENCE PHOTO LIBRARY BSIP PIR / SCIENCE PHOTO LIBRARY
Platelets. Coloured Scanning Electron Micrograph (SEM) of clusters of platelet cells adhering to the inside wall of a blood vessel. This blood vessel has been cut open to reveal its inside wall (lower left). The white streaks on the wall are clusters of minute platelets. Platelets play a vital role in blood clotting and in the repair of damage to blood vessel walls. When activated (by physical damage, turbulence or chemical factors) they change shape into spiky cells that mesh together in a clot. Clots of platelets help to seal ruptures in the wall of blood vessels, preventing leakage of blood. Magnification x120 at 35mm size.
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