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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.
Healthy Blood-Cell Formation. In a healthy person, the stem cells in the bone marrow make daughter cells. The daughter cells go through several stages of development within the marrow. Eventually they mature into red blood cells (RBCs), white blood cells (WBCs), or platelets.These get released from the marrow to circulate in the bloodstream. The circulating cells perform important functions. 1  RBCs carry oxygen throughout the body. 2  WBCs fight infection.ventually they mature into red blood cells (RBCs), white blood cells (WBCs), or platelets. These get released from the marrow to circulate in the bloodstream. The circulating cells perform important functions. 1  RBCs carry oxygen throughout the body. 2  WBCs fight infection.