The endocrine system is a network of glands and organs that produce and release hormones directly into the bloodstream. These hormones act as chemical messengers that travel through the blood to tissues and organs throughout the body, regulating a wide range of vital functions. Key functions of the endocrine system include:

• Controlling growth and development
• Regulating metabolism and energy levels
• Managing reproduction and sexual development
• Influencing mood and emotional responses
• Regulating blood pressure, blood sugar levels, and salt and water balance
• Responding to stress and injury
• Controlling sleep patterns and calcium balance

The system continuously monitors hormone levels and adjusts hormone release accordingly to maintain balance and proper function. Imbalances in hormone levels can lead to health problems, which can often be treated with medication

. Major glands involved in the endocrine system include the hypothalamus, pituitary, thyroid, parathyroid, adrenal glands, pancreas, ovaries, testes, pineal gland, and thymus. Each gland produces specific hormones that target particular organs or tissues to coordinate bodily functions

. In summary, the endocrine system acts as the body's internal communication and control system, using hormones to regulate nearly every aspect of physiology and maintain homeostasis.