Activated platelets, SEM
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Activated platelets, SEM
Activated platelets growing on a filter, coloured scanning electron micrograph (SEM). Platelets are cell fragments that circulate in the blood and contribute to blood clotting. Under normal circumstances, they are small and biconcave in form. However, if there is a break in the surface of a blood vessel, the platelet will come into contact with molecules not normally present in the bloodstream. These molecules, of which the protein collagen is an example, activates the platelets. They become amorphous in form, with long projections that help them adhere together. The platelets thus form a clot over the site of the break. Magnification: x2150 when printed 10 centimetres wide
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6421072
© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Activated Adhering Adhesive Amorphous Blood Clot Clots Clotted Clotting Filter Fragment Growing Histological Histology In Vitro Physiological Physiology Platelet Platelets Sticky Thrombocyte Thrombocytes Adhered False Coloured
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