Answer:
It helps in maintaining osmotic level of plasma and blood.
Step-by-step explanation:
The "excretory system" is a biological system that eliminates and removes unnecessary body fluids from the body thus prevents damage to the body. The excretory system has dual functions of removing waste from the body, it does so by eliminating the waste of metabolism and the used up and broken down components from the body.
Thus by removing waste from the body, it maintains an osmotic level of plasma and body. Also, maintains electrolyte balance in the body.