How do the kidneys regulate fluid level?

The kidneys regulate fluid levels by filtering blood to remove excess water and waste, which is then excreted as urine. They adjust the volume of urine produced based on the body’s hydration status, influenced by hormones such as antidiuretic hormone (ADH) and aldosterone. When the body is dehydrated, the kidneys conserve water by concentrating urine; conversely, when fluid levels are high, they excrete more dilute urine. This intricate balance helps maintain homeostasis and proper blood pressure.