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What is the structure of my bones?

Dr. Michael Roizen, MD
Internal Medicine
Most people think of bones as solid, hard all the way through. Actually, their physical structure is more like that of Swiss cheese: a solid mass dotted with tiny holes. Two kinds of cells work day and night to shape bone. Osteoblasts build up the structure, while osteoclasts, like little Pac-Men, break it down. The osteoblasts fill in the empty spaces with calcium and other minerals to make your bones hard and dense, while the Pac-Man osteoclasts chew up that bone and spit the calcium back into your bloodstream to circulate throughout the rest of your body.
YOU: The Owner's Manual for Teens: A Guide to a Healthy Body and Happy Life

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YOU: The Owner's Manual for Teens: A Guide to a Healthy Body and Happy Life

A few years ago, we wrote YOU: The Owner’s Manual, which taught people about the inner workings of their bodies—and how to keep them running strong. But you know what? There’s a big difference...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.