Ans: (1) Thyroxine is the main metabolic hormone in the body.
(2) Thyroxine maintains basal metabolic rate (BMR) by increasing glucose oxidation. It causes a calorigenic effect by producing energy.
(3) It also controls normal protein synthesis.
(4) The physical growth, development of gonads, and development of mental faculties is under the control of thyroxine.
(5) In particular in amphibians, it regulates tissue differentiation during metamorphosis.
(6) Body weight, respiration rate, blood pressure, heart rate, temperature, digestion, etc. is regulated by thyroxine.
(7) Another hormone of the thyroid, i.e. calcitonin regulates calcium metabolism of the body.
