Potassium plays a critical role in muscle contraction and is essential for maintaining overall cellular function. It helps regulate fluid balance and supports proper nerve communication, which is vital for muscle movement. When a muscle is stimulated, potassium ions flow in and out of cells, facilitating contraction and relaxation. Adequate potassium levels are necessary to prevent muscle cramps and weakness. Foods high in potassium, such as bananas, spinach, and sweet potatoes, should be incorporated into the diet to support muscle function and overall health.