Question

What are the functions of thyroxin

Answer 1

Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones

Answer 2

NCERT based Answer for Class 11 Biology Students

Functions of thyroxin hormones (T3 and T4):

 Thyroid hormones increase basal metabolic rate (BMR) by stimulating cellular oxygen use to produce ATP. As cells use more oxygen to produce ATP, more heat is given off and body temperature rises. This phenomenon is called the calorigenic effect of thyroid hormones. Thus these hormones play an important role in maintenance of normal body temperature (thermoregulation).

 In regulation of metabolism, thyroxins stimulate protein synthesis and increase use of glucose for ATP production. They increase lipolysis (fat breakdown) and enhance cholesterol excretion in bile thus reducing blood cholesterol level.

 Together with growth hormone, thyroid hormones accelerate body growth, particularly growth of nervous tissue. Deficiency of thyroid hormones during fetal development results in mental retardation.

 T3 and T4 support erythropoiesis (formation of RBCs).

 Thyroxines control tissue differentiation and metamorphism of tadpole into adult frog. It is evident from the fact that thyroid less tadpole fails to undergo metamorphosis. Deficiency of iodine in pool in which tadpoles are growing also leads to failure of metamorphosis.

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