They also get rid of waste products, especially a nitrogen-containing compound called urea. • The regulation of the amounts of water and minerals in the body. ADH increases water reabsorption by increasing the nephron’s permeability to water, while aldosterone works by increasing the reabsorption of both sodium and water. Key Terms osmoreceptors : Sensory receptors, primarily found in the hypothalamus, that detect changes in plasma osmolarity and contribute to the fluid-balance regulation in the body. Water leaves the body via the lungs when we exhale. This is known as excretion. A homeostatic goal for a cell, a tissue, an organ, and an entire organism is to balance water output with water … • The removal of metabolic waste. This happens primarily in the kidneys. A homeostatic goal for a cell, a tissue, an organ, and an entire organism is to balance water output with water … At the same time they hold on to useful substances such as glucose and protein so none is lost from the body. This is known as osmoregulation. Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water available for cells to absorb. In a day, there is an exchange of about 10 liters of water among the body’s organs. The amount of water in the blood must be kept more or less the same all the time to avoid cell damage as a result of osmosis ().There has to be a balance between the amount of water gained (from your diet though drinks and food and the water produced by cellular respiration) and the amount of water lost by the body (in sweating, evaporation, faeces and urine). Take a look at this tutorial to know how the body regulates blood sugar levels and temperature. The regulation of this exchange involves complex communication between the brain, kidneys, and endocrine system. We cannot control the level of water, ion or urea loss by the lungs or skin. This is mainly done by the skin. This is done by the excretory organs such as the kidneys and lungs. (1) ADH (antidiuretic hormone) from the posterior pituitary acts on the kidney to promote water reabsorption, thus preventing its loss in the urine. Regulation of Sodium and Water Balance. • The regulation of body temperature. The main job of your kidneys is to regulate the amount of water in the body and balance the concentration of mineral ions in the blood. The osmoregulation of this exchange involves complex communication between the brain, kidneys, and endocrine system. In a day there is an exchange of about 10 liters of water among the body’s organs. as well as excess carbon dioxide. Three major hormones are involved in regulating sodium and water balance in the body at the level of the kidney.