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, helping to maintain homeostasis within the body. Key glands include the pituitary gland, thyroid gland, and adrenal glands. Endocrine function is essential for coordinating complex bodily activities. For example, the pancreas releases insulin to manage blood sugar levels, while the adrenal glands produce hormones like adrenaline in response to stress. Proper endocrine function is crucial for overall health and well-being.