Excretion contributes to homeostasis by getting rid of urea, carbon dioxide, excess salts and excess water to maintain a stable body condition. These compounds are filtered from the blood by the kidneys, which then combine them to form urine. The urine is then passed by ureters to the bladder and is eventually excreted from the body through the urethra.
The kidneys are essential organs for proper excretion. If they fail, a person needs regular dialysis to remove the excess toxins, as accumulation of toxins can lead to death. Another way in which excretion contributes to homeostasis is by the skin’s perspiration. As part of the excretion system, the skin has glands that remove contaminants when someone sweats. The glands are conveniently situated in different body parts to collect and expel harmful elements. This way, the body keeps only what is essential for proper functioning. Similarly, blood is filtered as it circulates in the capillaries of the lungs. These wastes are excreted when a person exhales.
Finally, homeostasis benefits greatly from the detoxification of substances such as alcohol and chemicals by the liver. Here, the metabolism of proteins converts nitrogenous wastes into less toxic urea, which is eventually excreted by kidneys. The excretion system is essentially responsible for regulating the body’s temperature, acidity and alkalinity.