Endocrinology is a branch of biology and medicine dealing with the endocrine system, the endocrine system is a network of glands that produce and release hormones. These hormones are in charge of several functions in the body, from heartbeat to tissue growth to the creation of new life. These glands that produce and release hormones that help control many important body functions, including the body's ability to change calories into energy that powers cells and organs. The endocrine system influences how your heart beats, how your bones and tissues grow, even your ability to make a baby. It plays a vital role in whether or not you develop diabetes, thyroid disease, growth disorders, sexual dysfunction, and a host of other hormone-related disorders.