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What are bones made of and what roles do they serve in the body?
Updated: 11-Apr-2025

Bones are made of a hard outer layer of compact bone and a spongy inner layer that includes bone marrow. They're composed primarily of collagen and calcium phosphate, giving them strength and flexibility. Bones provide structure, protect internal organs, anchor muscles, and store minerals.

Bone marrow produces blood cells. The skeleton also enables movement by acting as a framework for muscles to pull against. Bones continuously remodel themselves throughout life to stay strong

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