Biology / Bio 3095 · Atom · ~20 seconds
Bone Marrow: Red and Yellow
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Red bone marrow produces blood cells inside spongy bone cavities, while yellow bone marrow stores fat and gradually replaces red marrow in many bones with age.
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An adult's red marrow concentrates in flat bones like the sternum, while long-bone shafts hold mostly yellow marrow.
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Yellow marrow can revert to blood-cell production under severe demand — the two types are not fixed permanently.