Question

Function of thyroxine is
A) Controls sperm production
B) Contracts the smooth muscles
C) Controls egg production
D) Controls general metabolism and growth in body

Answer 1

In controlling the metabolic rate of the body, brain growth, cardiac and digestive processes, muscle strength, and bone repair, thyroid hormones play essential roles.

Complete answer:
First we should know about thyroxine to answer this question. The primary hormone that the thyroid gland secretes into the bloodstream is thyroxine. It is the passive kind and much of it is transformed by organs like the kidney and liver to an active form named triiodothyronine. A feedback loop mechanism that includes the hypothalamus of the brain and the thyroid and the pituitary glands regulates the manufacture and secretion of thyroxin, thyroid hormones, and triiodothyronine.
Now, let us find the solution from the options-
- A major component of the endocrine system is the thyroid gland, which secretes a variety of hormones that influence everything from heart function to metabolism. Thus, option A is not the correct option.
- Thyroxine is a chemical secreted into the body by the thyroid gland. Thus, option B is not the correct option.
- With more than 99.9 percent of the hormones attached to serum proteins, thyroid hormones accumulate as thyroxine (T4) and triiodothyronine (T3 ). Thus, option c is not the correct option.
- In cardiac and digestive activity, digestion, brain growth, bone health, and muscle regulation, thyroxine plays a key role. It affects nearly all the processes of the body, meaning that adequate levels of thyroxine are vital for wellbeing.

Thus, the correct answer is option (D) Controls general metabolism and growth in the body.

Note: The thyrotropin-releasing hormone is secreted by the hypothalamus that in turn activates the pituitary gland to generate thyroid stimulating hormone. This hormone promotes the development of thyroid hormones by the thyroxine, thyroid gland, and triiodothyronine.