A hormone (from Greek"impetus") is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. Only a small amount of hormone is required to alter cell metabolism. The main function of endocrine glands is to secrete hormones directly into the bloodstream. Hormones are chemical substances that affect the activity of another part of the body (target site). In essence, hormones serve as messengers, controlling and coordinating activities throughout the body. Comment your views through Email: chemengineerapp@scitecjournals.com We are accepting Submission regarding the chemistry field directly online https://www.scitechnol.com/submission/ For more information check our website https://www.scitechnol.com/ you can also apply for membership or subscription.