The biological process of making new red blood cells in the bone marrow, which happens continuously to replace old cells that die.
From Greek erythro- (red) + -poiesis (formation/creation). Medical term describing the cellular manufacturing process of producing erythrocytes.
Your bone marrow manufactures about 2 million red blood cells every single second through erythropoiesis—that's roughly 200 billion per day—and if this process stops or slows, you become anemic within weeks, showing how critical this constant production is.
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