Why is excretion important in order to achieve osmotic balance?

Organisms have evolved mechanisms to regulate the concentrations of salts and water in the different fluid compartments such as the extracellular fluid, intracellular fluid, and blood plasma. In humans, kidneys play an important role in maintaining the osmotic balance by removing excess water, electrolytes, and waste from the body.

Osmotic balance refers to the appropriate concentration of water and salt in the different fluid compartments. Excretion plays an important role in regulating this balance to allow the proper functioning of the vital processes. The kidneys in humans play an important role in osmoregulation. They filter the blood and remove nitrogenous waste products such as urea, creatinine, and uric acid along with excess salts and water. The different parts of the nephron reabsorb the required water and salts and excrete the remaining through urine. This salt-water balance is also essential to maintaining blood volume and blood pressure. Hormones such as ADH also help the kidneys to maintain osmotic balance by controlling the amount of urine formed in the body.