Labels:text | screenshot | skeleton OCR: Where blood is made X Most of your blood cells Sku11 are made by the red marrow found inside certain bones in your body. These Shoulders bones are shown here in red. Sternum Red blood cells only live for Ribcage about four months before Pelvis they need to be replaced, so your bone marrow is Hips constantly at work making new cells. Some types of white blood cells are made in your bone marrow; others are made in your tonsils, spleen, and lymph nodes.
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