Liquid waste is held in the bladder until the bladder sends sensory information to the brain to let the brain know that the bladder is full. The brain controls the release of this waste What two systems are working together in this scenario?

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.