American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

What percentage of calcium resides in bones?

50%

75%

99%

The correct answer indicates that approximately 99% of the body's calcium is stored in bones. This high percentage underscores the crucial role bones play not just in providing structural support but also in regulating calcium levels necessary for various bodily functions. Calcium in the bones is critical for maintaining their strength and integrity, as well as serving as a reservoir that can release calcium into the bloodstream when needed for functions like muscle contraction, nerve transmission, and blood clotting.

While there is some calcium present in other bodily tissues and fluids, its contribution to overall calcium content is minimal compared to what is found in the skeletal system. For instance, a small percentage may circulate in the blood or be found in soft tissues, which is vital for immediate physiological needs. However, the vast majority remains sequestered in bone, making it the primary storehouse for calcium in the human body.

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