Collagen fibers of bone are hardened by deposition of_____________?
Correct answer: A. Ca & PO4
- A. Ca & PO4
- B. CaCO3
- C. CaSO4
- D. SiO2
Explanation
Bone collagen is hardened mainly by deposition of calcium phosphate, represented here as Ca and PO4, which forms mineral crystals in the matrix. The likely distractor is calcium carbonate, but calcium phosphate is the principal mineral salt responsible for bone hardness.
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