How dying blood cells are replaced
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When you give blood you lose red cells and the body needs to make more to replace them. Special cells in the kidneys, called peritubular cells, sense that the level of oxygen in the blood has decreased (due to the loss of red cells) and start secreting a protein called erythropoietin.
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New blood cells are formed from bone marrow.
When the body has low oxygen levels erythropoeitin is released and the bone marrow forms new blood cells. The process is called erythropoeisis.
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