NEET PG DENTAL EXAM

Detailed explanation-1: -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).

Detailed explanation-2: -Spongy bone is used for more active functions of the bones, including blood cell production and ion exchange. However, compact bones also serve a function in storing and releasing calcium to the body when needed.

Detailed explanation-3: -Compact bone (or cortical bone) forms the hard external layer of all bones and surrounds the medullary cavity, or bone marrow. It provides protection and strength to bones.

Detailed explanation-4: -Almost 70% of bone is made up of bone mineral called hydroxyapatite. Before the extracellular matrix is calcified, the tissue is called osteoid (bone-like) tissue. When the concentrations of calcium and phosphate ions rise high enough, they are deposited into the extracellular matrix, and the bone calcifies.