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A mineral stored in your bones that helps keep your heart beating and your brain thinking. It also makes your bones strong.
A firm but resilient material in the body and on the ends of bones that absorbs shock well and keeps the bones from getting hurt when they rub against one another.
A disease that causes weak and misformed bones. People can get this disease when they do not get enough vitamin D.
The layer of bone under the compact bone. It is a network of pores and tunnells interconnected in a pattern that makes the bone strong yet resilient.
Your body needs _____ to make strong bones. Your body makes this when it is exposed to the sun.
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