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Images Dated 21st January 1998

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Coloured TEM of activated platelets (thrombocytes) Featured 21 Jan 1998 Image

Coloured TEM of activated platelets (thrombocytes)

Platelets. Coloured transmission electron micrograph (TEM) of a section through activated platelets, or thrombocytes. Platelets are small, non-nucleated cells that circulate in the blood after forming in the bone marrow. Unactivated platelets are oval in shape and 2-3 micrometres in diameter. However these are activated platelets, as can be seen from their spiky dendritic processes or pseudopodia. Platelets help to plug defects in the walls of small blood vessels, and they are involved in clotting and the release of serotonin. Serotonin constricts damaged blood vessels, restricting blood flow and thus blood loss. Magnification: x300 at 35mm size