27.0: Introduction
The endocrine system influences almost every cell in the body. Several organs and glands comprise the endocrine system, which acts as a messenger system within the body. Endocrine glands release chemicals called hormones directly into the bloodstream. These hormones control processes that occur within the body. Endocrine hormones help to coordinate bodily functions such as emotions, growth, metabolism, mood, sexual function, and sleep. This chapter will introduce and focus on the thyroid and parathyroid glands.