Blood cells are made in bone marrow, so how does the blood get out of the bones and into the veins?

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Blood cells are made in bone marrow, so how does the blood get out of the bones and into the veins?

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Like a lot of other body parts, your marrow is also fed by blood vessels. So the cells just take the highway out, the same way material comes in to build them in the first place.

the marrow is no different than most ceels in your body, they need t obe supplied and expel waste, so they have blood vessels suplying them.