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All formed elements arise from stem cells of the red bone marrow. Recall that stem cells undergo mitosis plus cytokinesis (cellular division) to give rise to new daughter cells: One of these remains a stem cell and the other differentiates into one of any number of diverse cell types.
Report Abuse. The formed elements of blood are blood cells, which include erythrocytes (red blood cells), leukocytes (white blood cells), and thrombocytes (platelets). Thrombocytes are derived from special bone marrow cells, but in blood, they are present as cell fragments. Each microliter of blood contains 4 to 6 million erythrocytes, 4,500 to 10,000 leukocytes, and 150,000 to 400,000 thrombocytes.