Answer:

The bone matrix is the structural component of bones, providing support, strength, and flexibility. It is composed of both inorganic and organic components.

Inorganic Matter:
The inorganic matter of the bone matrix consists mainly of minerals, primarily hydroxyapatite crystals. These crystals are made up of calcium phosphate and calcium carbonate, which give bones their hardness and rigidity. In addition to calcium, other minerals such as magnesium, sodium, potassium, and fluoride are also present in smaller amounts. The inorganic matter accounts for about 40% of the bone matrix.

Organic Matter:
The organic matter of the bone matrix is primarily composed of collagen fibers. Collagen is a fibrous protein that provides the bone matrix with flexibility and tensile strength. It forms a framework that holds the minerals in place, preventing the bones from becoming brittle and easily fractured. Other organic components include various proteins, glycoproteins, proteoglycans, and bone cells. The organic matter accounts for about 60% of the bone matrix.

Explanation of the Correct Option:
The correct answer is option D, which states that the bone matrix consists of 40% inorganic matter and 60% organic matter. This is the most accurate representation of the composition of the bone matrix. The inorganic matter, primarily hydroxyapatite crystals, provides the hardness and rigidity of the bones, while the organic matter, primarily collagen fibers, provides the flexibility and tensile strength.

Summary:
- The bone matrix consists of both inorganic and organic components.
- The inorganic matter, primarily hydroxyapatite crystals, accounts for about 40% of the bone matrix.
- The organic matter, primarily collagen fibers, accounts for about 60% of the bone matrix.
- The correct answer is option D, which states that the bone matrix consists of 40% inorganic matter and 60% organic matter.