What is osmoregulation?

• A. The breakdown of proteins in the stomach.
• B. The exchange of gases in respiration.
• C. The control of water and solute concentrations within an organism or cell.
• D. The movement of ions across membranes during nerve impulses.

Answer: (C)

Osmoregulation is the process of maintaining stable water and solute levels inside an organism or cell. This balance keeps cells from swelling or shrinking and ensures enzymes and metabolic processes function properly. Organisms achieve this by regulating water intake and loss and by controlling the concentrations of ions and other dissolved substances, adjusting to changes in the external environment. This concept is distinct from digestion (breaking down food), respiration (gas exchange), or nerve signaling (movement of ions during impulses), which are different physiological processes.