(i) A group of endocrine glands which produces various hormones is called endocrine system. The endocrine system is also called hormonal system.
(ii) The endocrine system also helps in coordinating the activities of the body. The endocrine system in our body consists of a number of glands (or tissues) which store, and release chemicals called hormones.
(iii) The working of endocrine glands is controlled by the nervous system. The hormones produced by endocrine glands act as messengers between the nervous system and the organs of the body.