Hormones play an important role in regulating the body's metabolism, growth, development, reproduction, sex, sexual desire and sexual activity. They are chemical information substances synthesized by highly differentiated endocrine cells and directly secreted into the blood. Metabolic activities to affect the physiological activities of the human body. High-efficiency biologically active substances secreted by endocrine glands or endocrine cells transmit information as messengers in the body, and substances that regulate the physiological processes of the body are called hormones.