Frank watches his younger brothers facial expressions carefully as they view a pg-rated movie. during one scene, frank covers his brothers eyes and says, this part might scare you. i will tell you when it's over. frank is displaying

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.