The collagen fibers of bone are hardened by deposition of:
Correct answer: B. Calcium and phosphates
- A. Calcium and oxalates
- B. Calcium and phosphates
- C. Magnesium and nitrates
- D. Iron and glycogen
Explanation
Bone matrix is collagen fibres hardened by crystals of calcium phosphate, deposited as hydroxyapatite, which give bone its rigidity while the collagen provides flexibility. Calcium oxalate is the usual material of kidney stones rather than bone, and iron and glycogen have no structural role in the matrix.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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