The system responsible for hormonal regulation in the body is the endocrine system. This complex network includes various glands that secrete hormones directly into the bloodstream, influencing numerous physiological processes such as metabolism, growth, reproduction, and mood. Key components of the endocrine system include the pituitary gland, thyroid gland, adrenal glands, and pancreas, each playing vital roles in maintaining homeostasis. Through hormone signaling, the endocrine system interacts with other systems, including the nervous system, to coordinate body functions and respond to internal and external stimuli effectively.