What is the main function of the renal system during exercise?

The renal system plays a crucial role during exercise, primarily focusing on regulating fluid and electrolyte balance. When an individual engages in physical activity, several physiological changes occur, including increased sweating and potential shifts in blood plasma volume. The kidneys work to maintain homeostasis by filtering blood, excreting waste, and adjusting the retention of water and electrolytes. This regulation is vital to prevent dehydration and maintain blood pressure, which can be affected during vigorous exercise. By ensuring that electrolytes such as sodium and potassium remain balanced, the renal system helps support muscular function and overall cardiovascular stability during physical exertion.