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bone

bone

/bōn/

Noun

The functional unit of the skeletal system is the bone cell. Bones appear to have a wide variety of sizes and shapes; however they are similar in composition. All bones are made up of a combination of live cells embedded in a matrix of collagen and mineral salts (such as calcium). Collagen provides the primary strength of the bone and is somewhat resilient, allowing for flexibility. The salts cause the bone to be hard, making it difficult to crush.