define blood platelets in biology
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Platelets are tiny blood cells that help your body form clots to stop bleeding. If one of your blood vessels gets damaged, it sends out signals to the platelets. ... They also send out chemical signals to attract more platelets.
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Blood platelets are minute oval around structures, non nucleated, floating in the blood. These are about 2 lakh to 4 lakh per cubic millimetre of blood in an adult. The platelets are derived from some giant cells called Megakaryocytes in the red bone marrow. These are budded off from the Megakaryocytes in a manner that each one is completely surrounded with the membrane. There life span is 3 to 5 days and are destroyed mainly in spleen. They are very important in clotting of blood.
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