Hormones are chemical messengers in the body which are produced and secreted by glands in the endocrine system. They play a crucial role in most bodily functions, from simple basic needs like hunger to complex systems like reproduction, and also our emotions and mood.Hormone Health Network. (n.d.). What Are Hormones and What Do They Do?. [online] Available at: https://www.hormone.org/hormones-and-health/hormones/hormones-and-what-do-they-do [Accessed 22 Nov. 2018].