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  4. Megakaryocytes, special cells in the bone marrow produce cell fragments are called

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Q. Megakaryocytes, special cells in the bone marrow produce cell fragments are called

J & K CETJ & K CET 2014Body Fluids and Circulation

Solution:

Megakaryocytes are present in red bone marrow. These special cell, present in bone marrow produce cell fragments, which are called platlets or thrombocytes. The later have a life span of only two or three days and are constantly being replenished by megakaryocytes. Flatlets lakl DNA synthesis ability and their number varies from $250,000-4,00000$ per cubic milimeter of blood. Leuicocytes and erythrocytes are also produced in bone marrow but there are not formed by the fragments of grant megakaryocytes.