Which mineral is most abundant in the skeletal system?

Calcium is the most abundant mineral in the skeletal system, playing a vital role in maintaining bone health and structure. Approximately 99% of the body's calcium is stored in the bones and teeth, where it provides strength and rigidity. This mineral is essential not only for the development of the skeletal system but also for various physiological functions, including muscle contraction, blood clotting, and nerve transmission.

In addition to its structural role, calcium works in conjunction with phosphorus, another significant mineral found in bones, to form hydroxyapatite, which is the mineral complex that gives bones their hardness. While magnesium and iron are important for other physiological functions—magnesium for enzymatic processes and iron for oxygen transport—their concentrations in the bones are much lower compared to calcium. Therefore, calcium's prominence in the skeletal system makes it the correct answer to this question.