NEET BIOLOGY

Detailed explanation-1: -Bone cells are embedded in a hard matrix that is composed of calcium and phosphorus compounds. These compounds are responsible for the hardness of the bone tissue.

Detailed explanation-2: -The hardness and rigidity of bone is due to the presence of mineral salt in the osteoid matrix, which is a crystalline complex of calcium and phosphate (hydroxyapatite). Calcified bone contains about 25% organic matrix (2-5% of which are cells), 5% water and 70% inorganic mineral (hydroxyapatite).

Detailed explanation-3: -By volume, bone comprises of 36% inorganic, 36% organic and 28% water. The inorganic/mineral component comprises of calcium and phosphate in the form of needle-like or thin plates of hydroxyapatite crystals [Ca10(PO4)6(OH)2]. These are conjugated to a small proportion of magnesium carbonate, sodium and potassium ions.

Detailed explanation-4: -Osteocytes. Osteocytes are cells derived from osteoblasts that are embedded in the bone matrix.

Detailed explanation-5: -Bone cells are embedded in a hard matrix, which is formed by collagen protein fibres, and hardened by calcium and phosphorus salts.