How Drugs Affect the Brain: what is happening under Normal Conditions?

Explanation:

Usually when someone takes a drug, they want to take it more because the brain feels satisfied and wants more of that stuff. When the person keeps taking the drug, the brain may become hurt or the brain needs time away from drugs to recover. But when someone stop taking drugs abruptly, the person may feel depressed.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.