What is one of the key functions of potassium (K) in the body?

One of the key functions of potassium in the body is its role in regulating water balance. Potassium is an essential electrolyte that helps maintain proper fluid balance within cells and throughout the body. It does this by working in conjunction with sodium, another electrolyte, to create gradients that drive the movement of fluids into and out of cells. This balance is critical for normal cell function, muscle contraction, and nerve signal transmission. Furthermore, maintaining optimal potassium levels is vital for the prevention of dehydration and for the overall maintenance of blood pressure and heart function. Therefore, its role is foundational in the homeostasis of bodily fluids.