Which mineral is involved in the regulation of fluid balance in the body?

Sodium is a crucial mineral involved in regulating fluid balance in the body. It plays a key role in maintaining osmotic pressure, which helps keep the right amount of fluids in the body’s compartments, including blood plasma and cells. Sodium ions are essential for the function of cells and tissues, contributing to the balance between intracellular and extracellular fluid. When sodium levels are balanced, they contribute to proper hydration and blood pressure regulation.

In addition to its role in fluid balance, sodium is vital for nerve transmission and muscle contraction. Through its interaction with other electrolytes and the kidneys, sodium helps to control fluid retention and excretion, ultimately influencing blood volume and systemic pressure.

The other minerals listed—calcium, magnesium, and iodine—have their own important roles in the body but do not play a primary role in fluid balance. Calcium is primarily associated with bone health and muscle contraction, magnesium plays a role in muscle and nerve function as well as energy production, and iodine is essential for thyroid hormone production.