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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.
Blood Formed Elements. The formed elements are cells, cell remnants, and cell fragments in the blood. Red blood cells (RBCs or erythrocytes) make up more than 95% of the formed elements. Because they lack a nucleus and organelles, most RBCs in the blood stream are not fully functional cells.lso included in the formed elements are five types of white blood cells (WBCs or leukocytes). They are part of the immune system and that helps protect the body from foreign invaders.