Control in Humans
This consists of the following; water, ions, blood sugarand temperature. Temperature is a condition in the body and the other 3 are physical substances in the body.
All chemical reactions happen in a watery environment and it can stop dehydration. Water can enter the body by drinking and food, we also loss water from our body by breathing and sweating which is caused by the temperature outside. You can alos loss water by urinating (via the Kidney).