What percentage of the human skeleton's composition is inorganic material?

• A. 75%
• B. 25%
• C. 90%
• D. 50%

Answer: (A)

The correct choice indicates that approximately 75% of the human skeleton's composition is made up of inorganic material. This inorganic portion is primarily composed of minerals, most notably hydroxyapatite, which is a crystalline structure made of calcium and phosphate. These minerals provide strength and rigidity to the bones, playing a crucial role in their overall structural integrity.

In addition to the inorganic materials, the skeleton also contains organic components, primarily collagen, which contributes to the flexibility and resilience of bones. The balance between these inorganic and organic materials is essential for normal bone metabolism and overall skeletal health. Understanding the composition is important for various applications in bone densitometry, as it relates to bone health, conditions such as osteoporosis, and the effectiveness of treatments aimed at improving bone density.