Final answer:
Platelets, also known as thrombocytes, are cell fragments derived from megakaryocytes. They are involved in blood clotting and are released into the bloodstream. Thrombopoietin stimulates the production of megakaryoblasts, which mature into megakaryocytes and release platelets.
Step-by-step explanation:
Platelets are more commonly known as thrombocytes, which are cell fragments rather than complete cells. They are derived from megakaryocytes, which are large cells found in the bone marrow. Thrombopoietin, a glycoprotein, stimulates the production of megakaryoblasts, which then mature into megakaryocytes and release platelets into the bloodstream. Each megakaryocyte can release thousands of platelets during its lifespan.