The brain and kidneys collaboratively regulate water excretion, with the kidneys adjusting urine concentration and the release of ADH by the brain in response to hydration levels.
Water excretion is regulated by the brain and the kidneys. The process of maintaining a balance between water intake and water output is known as homeostasis. The kidneys play a critical role in this balance through urine production, adjusting the urine concentration depending on the body's water needs.
In dehydrated conditions, the osmoreceptors in the hypothalamus sense increased blood solute concentrations and stimulate the release of antidiuretic hormone (ADH), which prompts the kidneys to conserve water by increasing water reabsorption.
So, the kidneys are vital for regulating water excretion, supported by signals from the brain in response to the body's hydration levels.