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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.
Red Blood Cells (RBCs) a.k.a. erythrocytes. Rbc's constitute the largest component of the formed elements (99.9%). The hematocrit is the percentage volume of blood contributed by the formed elements. It is also called volume of packed red cells (VPRC) and packed cell volume (PCV).