Word! Bone Marrow (for Kids) - Children's Hospital of San Antonio (Christus Health)
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Word! Bone Marrow

Bone Marrow

Say: bone 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.