Читать книгу A Practical Approach to Special Care in Dentistry - Группа авторов - Страница 256

Hyperthyroidism is characterised by an increase in serum concentrations of the thyroid hormones, thyroxine (T₄) and tri‐iodothyronine (T₃). The secretion of T₃ and T₄, which occurs in thyroid gland follicles, is normally controlled by thyroid‐stimulating hormone (TSH), a protein secreted from the anterior pituitary gland, which in turn is regulated by thyrotropin‐releasing hormone (TRH), produced in the hypothalamus. When serum concentrations of thyroid hormones are elevated, TSH secretion is suppressed by a negative feedback mechanism.