GENERAL HISTOLOGY

Detailed explanation-1: -Osteoid refers to the young hyaline matrix of true bone in which calcium salts are deposited. Osteoid makes up about 50% the of bone volume and 40% of bone weight. It is composed of fibres and ground substance. So, the correct answer is ‘Young hyaline matrix of true bone in which calcium salts are deposited’.

Detailed explanation-2: -bone formation secrete a matrix material called osteoid, a gelatinous substance made up of collagen, a fibrous protein, and mucopolysaccharide, an organic glue. Soon after the osteoid is laid down, inorganic salts are deposited in it to form the hardened material recognized as mineralized bone.

Detailed explanation-3: -The organic portion of the bone matrix consists of collagen fibers (type I), proteoglycans, and glycoproteins (e.g. osteonectin and osteocalcin). The organic material is produced and secreted by the osteoblasts.

Detailed explanation-4: -Osteoid is an unmineralized organic tissue that eventually undergoes calcification and is deposited as lamellae or layers in the bone matrix.