The functions of thyroxine and tri-iodothyronine ’ are as follows:
(a) They regulate the metabolic rate of the body and thus maintain basal metabolic rate.
(b) They stimulate protein synthesis and promote growth of the body tissues.
© They regulate the development of mental faculties.
(d) As they increase heat production, they maintain body temperature.
(e) They help in metamorphosis of tadpole into adult