What is one of the functions of sodium in the body?

Sodium plays a crucial role in maintaining fluid balance in the body. It is an essential electrolyte that helps regulate the amount of water in and around cells. Sodium attracts water, which is vital for maintaining proper hydration levels within the body's compartments. This regulation is important for various physiological processes, including blood pressure control and maintaining the balance of fluids in and out of cells and tissues. By helping to manage fluid levels, sodium supports overall homeostasis, ensuring that bodily functions operate effectively.

While other functions such as muscle contraction and aspects of bone health involve electrolytes, they are more directly associated with other substances, such as calcium and potassium in muscle contraction and bone structure. Sodium's primary and well-established role emphasizes its importance in fluid balance.