What does the thyroid secretes?

Answer 1

The thyroid is a glad at the base of your neck, next to the throat that produces the hormones thyroxine and triiodothyronine, which are tyrosine-based hormones primarily responsible for regulation of metabolism.

Answer 2

The thyroid secretes two main thyroid hormones. One of these hormones is called 'T4' or 'thyroxine' and the other is called 'T3' or triiodothyronine. The gland secretes roughly 80% T4 and 20% T3. There are very tiny amounts of other thyroid hormones known as T2 and T1 but they don't appear to be clinically very important as the vast majority of hypothyroid patients do well on T4 supplementation alone and nearly all those who are still dissatisfied feel well again once T3 is added as well.

All of the T4 produced by the thyroid undergoes peripheral deiodination in the liver to become T3 as T3 is the metabolically active thyroid horome.