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What Is Bone Marrow?

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Bone Marrow

Say: MAIR-oh

Bone marrow is a thick, spongy kind of jelly inside your bones. Bone marrow makes all kinds of blood cells: red blood cells that carry oxygen, white blood cells that fight infections, and platelets that help blood clot.

A KidsHealth Education Partner Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

Images sourced by The Nemours Foundation and Getty Images.