Which type of drugs work by stopping the transmission of pain impulses to the brain and spinal cord by preventing the section of pain?

i'm pretty sure questions like these aren't allowd.   but, sure.   i can and talk : ))

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.