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platelets |
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Platelets Fragments of a large precursor cell (a megakaryocyte) found in the bone marrow. These fragments adhere to areas of blood vessel damage and release chemical signals that direct the formation of a blood clot. Mentioned in: Antituberculosis Drugs, Blood Donation and Registry, Bone Marrow Transplantation, Chemotherapy, Hantavirus Infections, Hemophilia, Platelet Aggregation Test, Platelet Function Disorders, Transient Ischemic Attack, Von Willebrand Disease, Wiskott-Aldrich Syndrome platelets [plat′lits] Etymology: Fr, small plate the smallest cells in the blood. They are formed in the red bone marrow, and some are stored in the spleen. Platelets are disk-shaped, contain no hemoglobin, and are essential for the coagulation of blood and in maintenance of hemostasis. Normally between 200,000 and 300,000 platelets are found in 1 mL3 of blood. Also called thrombocyte. Compare erythrocyte, leukocyte. See also thrombocytopenia, thrombocytosis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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