Which of the following minerals is considered a major mineral in the body?

Calcium is classified as a major mineral in the body due to its significant role in various physiological functions and the large quantities that are required for optimal health. It is essential for maintaining healthy bones and teeth, as approximately 99% of the body's calcium is stored in these structures, providing strength and rigidity. Additionally, calcium plays a critical role in muscle contraction, nerve transmission, and blood clotting.

The designation of "major mineral" is generally based on the body’s requirement for these minerals in larger amounts, typically more than 100 milligrams per day. Calcium meets this criterion, as the recommended daily intake for adults ranges from 1,000 to 1,200 milligrams, depending on age and gender.

In contrast, iron, zinc, and copper are all classified as trace minerals because they are required in much smaller amounts, generally measured in micrograms rather than milligrams. While these trace minerals are vital for specific functions, such as oxygen transport (iron) or enzymatic reactions (zinc and copper), they do not meet the threshold for classification as major minerals. This understanding of mineral classification is important for nutritional guidance and maintaining overall health.