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Allegedly – according to rumors,

Thyroxin is a hormone secreted by the thyroid gland of the endocrine system

Responds to signals initially derived from the hypothalamus

Thyroid system

the role of thyroxin is to increase body's metabolic rate.

Since thyroxin causes an increase in the body's metabolic rate, there is an increase in the breakdown of lipids, carbohydrate metabolism.

A consequence of increasing the metabolic activity is the production of heat - hence thyroxin helps to control body temperature