Potassium plays a crucial role in bodily function, including regulating fluid balance, muscle contractions, and maintaining nerve signal transmission. It helps maintain normal blood pressure by counteracting the effects of sodium and promoting vasodilation in blood vessels. Adequate potassium intake can prevent hypertension and reduce the risk of kidney stones. Additionally, it contributes to optimal muscle function and athletic performance by facilitating proper muscle contractions and reducing cramping. Foods rich in potassium include bananas, oranges, and leafy greens, making them essential for a balanced diet.