The hypothalamic-pituitary–thyroid axis (HPT axis) is part of the neuroendocrine system responsible for the regulation of metabolism and also response to stress. The hormones that make up the HPT axis control the metabolic processes of all cells in the body. The secretion of thyroid releasing hormone (TRH) from the hypothalamus activates the HPT axis. TRH stimulates the release of thyroid stimulating...