: How does the body produce blood?
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Bones are actually highly vascular, meaning a lot of blood flows through them. Long bones in particular, like your femur and other limbs, have red marrow which serves as a blood factory.
Blood cells of all kinds come from stem cells in the bones–called stem cells because, like on a tree branch, they can change in a few directions to become different cells. Red blood cells lose their nucleus and get packed full of hemoglobin, the iron-containing protein that carries oxygen. White blood cells of various types go on to serve immunity.
The fluid is simply absorbed by your colon, as all fluid in the body is, and processed in various places such as the liver and kidneys. The cells come from your bones. Nutrients and oxygen are gathered in the gut and lungs, respectively. Serum proteins like albumin, another important part of blood… are produced by blood cells, I think? It’s been some years.
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