Which of the following are considered major minerals in the body?

Major minerals, also known as macrominerals, are minerals that are required by the body in larger amounts for various physiological functions. Calcium and potassium are recognized as key major minerals because they play vital roles in several bodily functions.

Calcium is essential for building and maintaining strong bones and teeth. It is also involved in muscle function, nerve signaling, and blood clotting. The body requires a significant amount of calcium daily, hence its classification as a major mineral.

Potassium is critical for maintaining proper fluid balance, nerve function, and muscle contractions. It helps regulate blood pressure and is important in the function of all cells in the body.

In contrast, other options present trace minerals, which, while important for health, are required in much smaller amounts. Iron and zinc, for instance, are vital for specific functions such as oxygen transport and immune response but are classified as trace minerals. Fluoride and copper, as well as selenium and iodine, also belong to the category of trace elements and are needed in tiny quantities. Thus, calcium and potassium are the correct answer, being recognized as major minerals necessary for overall health.