Blood clot, SEM

Blood clot, SEM

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Caption: Coloured scanning electron micrograph of human red blood cells trapped in a fibrin blood clot (menstrual). Platelets are cell fragments in the blood that play an essential role in blood clotting and wound repair. Platelets can also activate certain immune responses. Platelets in the blood are small oval disks and are termed non-activated platelets or thrombocytes. Platelets serve as the body's first line of defence to prevent excessive blood loss. When an injury such as a cut is sustained, platelets change their shape (now known as activated platelets), become sticky and build up on a vessel wall to form a plug. They are also involved in the secretion of a chemical platelet factor which helps produce threads of fibrin. Blood cells collect in the entangled fibrin and platelet mass forming a blood clot at the site. Magnification: x2,000 when shortest axis printed at 25 millimetres.

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