Which of the following minerals plays a role in cellular fluid balance and affects the risk of dehydration during exercise?

All of the listed minerals—sodium, chloride, and potassium—are essential for maintaining cellular fluid balance and play significant roles in hydration status, especially during exercise.

Sodium is critical for regulating extracellular fluid volume and helps maintain blood pressure. During exercise, sodium lost through sweat can lead to imbalances if not adequately replaced, increasing the risk of dehydration.

Chloride, often found alongside sodium, works to maintain osmotic pressure and fluid balance in the body. It also plays a role in gastric function and helps with the transport of carbon dioxide in the blood. Adequate chloride levels help sustain hydration during physical activity.

Potassium is crucial for proper cellular function, including muscle contraction and nerve signaling. It helps regulate fluid balance within the cells and is vital for preventing muscle cramps and maintaining overall hydration.

Since each of these minerals helps to regulate fluid balance and impacts dehydration risk during exercise, choosing "All of the above" recognizes the combined importance of these minerals in supporting hydration and physiological function during physical activity.