nformation of erythrocytes

nthe body must produce about 2.5 million new RBCs every second
nin adults, erythropoiesis occurs mainly in the marrow of the sternum, ribs, vertebral processes, and skull bones
nbegins with a cell called a hemocytoblast or stem cell (below)
nrate is regulated by oxygen levels:
nhypoxia (lower than normal oxygen levels) is detected by cells in the kidneys

nkidney cells release the hormone erythropoietin into the blood
nerythropoietin stimulates erythropoiesis by the bone marrow.

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