Which hormone is produced by the thyroid gland?

The thyroid gland primarily produces thyroxine, also known as T4. This hormone plays a critical role in regulating metabolism, growth, and development in the body. Thyroxine influences how the body uses energy and can affect various bodily functions, including heart rate, digestive function, muscle control, brain development, and bone maintenance.

Thyroxine production is essential for the proper functioning of many systems, making it a key hormone for maintaining overall health. It is synthesized from iodine and the amino acid tyrosine, both of which are crucial for the thyroid's ability to produce this hormone efficiently.

The other hormones listed, such as adrenaline and cortisol, are produced by the adrenal glands, while insulin is produced by the pancreas. Each of these hormones has unique functions that are vital to the body but are not related to the thyroid's output. This distinct production of thyroxine makes it the correct choice when identifying which hormone is specifically produced by the thyroid gland.