Question 13 Select one answer.   Which of the following is properly matched with its function?  A. Osteoclasts -- break down and reabsorb bone  B. Osteocytes -- mature bone cells that act as sensors for repair C. All of the above are correctly matched with their function.  D. Osteoblasts -- deposit and build new bone  Question 20 Select one answer.  Which nanostructure is responsible for compression resistance in bone?  A. calcium  B. proteoglycans  C. collagen  D. hydroxyapatite

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