Our bones grow and change over our whole life. Marcella Cheng/The Conversation

Curious Kids: Why do we have bones?

Bones protect our insides, help us to move and even help make our blood.
Dietary calcium is necessary to ensure our bones hold on to all the calcium they need to stay strong. Incase/Flickr

Explainer: how do our bones get calcium and why do they need it?

If dietary calcium is in short supply, calcium is released from bone to maintain the critical level in the bloodstream needed for nerve and muscle function.

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