The endocrine system is a network of glands that produce and release hormones, which are chemical messengers that regulate various bodily functions. These hormones control processes such as growth, metabolism, and mood. Key glands in the endocrine system include the pituitary gland, thyroid gland, and adrenal glands. Hormones travel through the bloodstream to target organs and tissues, influencing their activity. For example, the insulin hormone, produced by the pancreas, helps regulate blood sugar levels. The proper functioning of the endocrine system is essential for maintaining overall health and homeostasis in the body.