The urinary system consists of the kidneys, ureters, bladder and urethra.
In the body of all living beings, including man, various substances necessary for its construction or serve as a source of energy are constantly introduced. During the change of these substances, ie in the processes of metabolism, harmful products are created in the body, which must be separated and expelled from the body as soon as possible.
These organs participate in the regulation of the volume and composition of body fluids. By means of the urinary system, all harmful substances (end products of metabolism, toxins, etc.), as well as excess water and electrolytes, are eliminated from the blood plasma, and urine is formed.
The largest amount of harmful substances is excreted through the kidneys. Cessation of kidney function would lead to deadly blood poisoning.