The bone matrix has the following crystals: (A) Calcium hydroxyapatite, (B) Calcium pyrophosphate, (C) Calcium phosphate, (D) Calcium sulphate
Answer is A. The bone is made up of bone cells and extracellular matrix.The matrix consists oftwo types of materials,organic and inorganic. The organic matrix is formed by the collagen,which forms 30-35% of dry weight of a bone. The inorganic matrix is primarily calcium and phophorus salts,especially hydroxyapatite .It constitutes about 65-70% of dry weight of a bone. ref:maheswari,5th edition page no.9