what system controls muscles and regulates body activities
Functions of the Endocrine System. The Endocrine system (along with the nervous system) controls and regulates the complex activities of the body. The Endocrine system regulates the activities of the body by secreting complex chemical substances (hormones) into the blood stream.These secretions come from a variety of glands which control various organs of the body. The key functions are: 1  To regulate the metabolic functions of the body.ormones. are secreted from the glands of the endocrine system, they are specific in that each hormone causes a response in a specific target organ or group of cells, rather than on the body as a whole. Exocrine hormones are secreted via a duct into the blood and usually effect a distant organ or tissue.