Kidney is an important organ of human body. Its basic function is to produce urine, so as to remove metabolites and some wastes and poisons in the body. At the same time, it can retain water and other useful substances, such as glucose, protein, amino acids, sodium ion, potassium ion, sodium bicarbonate, etc., through reabsorption function, so as to regulate water, electrolyte balance and maintain acid-base balance.

At the same time, the kidney also has endocrine function, producing renin, erythropoietin, active vitamin D3, prostaglandin, kinin and so on. It is also the degradation site of some endocrine hormones and the target organ of extrarenal hormones. These functions of the kidney ensure the stability of the internal environment and normal metabolism.

Source: @arielfendertattoo