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Unformatted text preview: (platelets). Production of Formed Elements o Formed elements arise (hematopoiesis) in red bone marrow from stem cells. Erythrocytes o Erythrocytes are disk-shaped cells containing hemoglobin, which transports oxygen and carbon dioxide. Erythrocytes also contain carbonic anhydrase, which is involved with carbon dioxide transport. o In response to low blood oxygen levels, the kidneys produce erythropoietin, which stimulates erythrocyte production in red bone marrow. o Worn-out erythrocytes are phagocytized by macrophages in the spleen or liver. Hemoglobin is broken down, iron and amino acids are reused, and heme becomes bilirubin that is secreted in bile....
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- Fall '10