Chemicals that are manufactured by endocrine glands and circulated in the bloodstream to change or maintain bodily functions are called hormones. The hormones are the chemical messengers of the body for the proper function of the processes. It is a part of the endocrine system. These substances are produced from the endocrine glands. These hormones are transported to the different parts of the body through the blood stream. These substances affects growth and development, mood, sleep behaviors, how stress is manage and how the body would break down food.