Beside excretion of waste products, excretory systems have another very important function helping to maintain a constant internal environment. For living cells to function properly, blood and tissue fluids must be kept at a constant osmotic pressure. The osmotic pressure of these fluids depends on the amount of dissolved substances and water present in them, I.e. the osmotic concentration. this pressure is kept constant by regulating the amount of water and solutes in the body fluids. This mechanism is called water balance or Osmoregulation.
Osmoregulation and excretion go hand in hand as both are concerned with the maintenance of a constant internal environment (homeostasis).
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