An area in the brain which monitors the amount of water in the blood is the

*keep in mind this is middle school science*

I believe it's the hypothalamus. The hypothalamus is a section of the brain responsible for the production of many of the body’s essential hormones, chemical substances that help control different cells and organs. The hormones from the hypothalamus govern physiologic functions such as temperature regulation, thirst, hunger, sleep, mood and more

Iwolud you, but i dont know what you are asking.