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canvas prints abnormal canvas prints green background canvas prints blood clot canvas prints blood clotting canvas prints circulatory system canvas prints clot canvas prints colored canvas prints coloured canvas prints false color canvas prints false-coloured canvas prints human canvas prints human blood canvas prints human body canvas prints medical canvas prints platelet canvas prints

photographs abnormal photos green background photos blood clot photos blood clotting photos circulatory system photos clot photos colored photos coloured photos false color photos false-coloured photos human photos human blood photos human body photos medical photos platelet photos

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Activated and non-activated platelets, coloured scanning electron micrograph (SEM). Platelets are blood cell fragments that play an essential role in blood clotting and wound repair, and can also activate certain immune responses. Platelets in the blood are small oval disks and are termed non-activated platelets or thrombocytes. They are the body's first line of defence against excessive blood loss. When an injury such as a cut is sustained, platelets (now known as activated platelets) change their shape, become sticky and build up on a vessel wall to form a plug. They are also involved in the secretion of chemical platelet factors which help produce threads of fibrin. Bloods cells collect in the entangled fibrin and platelet mass forming a blood clot at the site. Magnification: x3,000 when shortest axis printed at 25 millimetres.

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