The biological process of forming new blood cells, which happens mainly in bone marrow.
From Greek haima (blood) + poiesis (making/creation). The term combines the medical understanding that blood cells must be continuously manufactured to replace dying ones.
Your bone marrow is creating about 2 million new red blood cells every single second—if this process stops, you die within weeks, which is why leukemia (cancer of blood-forming cells) is so serious and urgent to treat.
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