T3 and T4 - also known as triiodothyronine and tetraiodothyronine or thyroxine - are produced by the thyroid gland.
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They play roles of fundamental importance for the organism and are involved both in the metabolism and in the development of tissues and organs.
In the course of this article, the main functions and characteristics of these hormones will be briefly summarized and the relationship between thyroid hormones T3 and T4 and physical exercise will be analyzed.
