This biology report provides a comprehensive overview of the endocrine system, detailing its structure, including the hypothalamus, pituitary, thyroid, parathyroid, adrenal, pineal, and reproductive glands, as well as the pancreas. It explores the functions of hormones in regulating body development, metabolism, and other processes. The report explains the control of blood glucose levels through the actions of insulin and glucagon. Furthermore, it discusses the effects of hormone imbalances, using underactive thyroid (hypothyroidism) as a specific example, and outlines its impact on various body systems, including brain function, metabolism, and reproductive health. Finally, the report compares the modes of action in the endocrine and nervous systems. The report is well-researched and supported by several academic references.