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Home > All Images > 1998 > January > 21 Jan 1998

Images Dated 21st January 1998

Choose from 18 pictures in our Images Dated 21st January 1998 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


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

© DR GOPAL MURTI/SCIENCE PHOTO LIBRARY