Final answer:
Potassium is involved in many body functions, except fluid balance.
Step-by-step explanation:
Potassium is involved in many important body functions, but it is not involved in fluid balance. Fluid balance plays a crucial role in maintaining the body's hydration levels and regulating the movement of fluids within and between cells. Potassium, on the other hand, is essential for the contraction and relaxation of muscles, transmission of nerve impulses, and cellular metabolism. For example, it helps in the proper functioning of the heart muscle, nerve cells, and the production of energy by cells.
Learn more about Potassium's involvement in various body functions