The main purpose of the endocrine system is to regulate physiological processes through the secretion of hormones. These hormones travel through the bloodstream to target organs and tissues, influencing functions such as metabolism, growth, reproduction, and stress response. The endocrine system maintains homeostasis by coordinating various body systems, ensuring that internal environments remain stable despite external changes. Key glands in the endocrine system include the pituitary, thyroid, and adrenal glands. Understanding this system is essential for diagnosing and treating hormonal disorders and understanding overall health.