Excretion is the biological process by which an organism removes metabolic waste products and excess substances from its body fluids. This critical function is necessary to maintain homeostasis by regulating internal chemical balances, including the precise concentrations of salts, water, and nitrogenous wastes. Various biological systems are responsible for this removal, filtering waste components from the bloodstream and excreting them via urine, sweat, or other bodily fluids. The efficient management of these waste materials prevents the buildup of toxic substances that could impair cellular function and lead to systemic failure.