Scanning electron micrograph of an unactivated blood platelet. Platelets (thrombocytes) are small,non-nucleated cells formed in the bone marrow,and are present in circulating blood in large numbers. Their shape in an unactivated state is round or oval (2-3 micrometres diameter),as here; activated platelets have dendritic processes,or pseudopodia. Platelets function in 2 ways. Firstly,they help plug small defects in the walls of small blood vessels: secondly,they are involved in clotting & also release serotonin,which reduces blood flow by constricting the damaged vessels. Magnification: x53,000 at 8x10inch size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NIBSC |
Bildgröße: | 5394 px × 3584 px |
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Eigentums-Rechte: | nicht erforderlich |
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