The kidney is an important organ of the human body. In addition to producing urine, it can also remove metabolites and certain wastes and poisons from the body, while retaining water and other useful substances through reabsorption to regulate water and electrolyte balance and maintain acid-base balance. All in all, it is of great significance to the normal survival activities of the body. Each kidney is composed of more than 1 million kidney units, and when this batch falls, another batch will go up.