It is a hormone belonging to the thyroid group, this being because it is secreted by the thyroid gland, in addition to being considered the main of its kind. It comes from iodine, which is adsorbed by the gland that produces thyroxine and fuses with tyrosine, to form an amino acid together with other compounds. At the time of passing into the body, it is released with some proteins, and through hydrolysis the body will receive the amount that is required. Thus, the average life of thyroxine is only one week. Triiodothyronine is the compound that keeps this chemical within itself, being much more powerful.
Basically, thyroxine is responsible for having a strict control over cellular activity, so it has the power to return to a slow metabolism if the expulsion is not so common, causing the body to gain weight or in extreme cases, anomalies with respect to the system cardiovascular and a much more acute sensitivity when receiving stimuli specifically in the skin. Otherwise, exaggerated thyroxine secretion represents, in its most general sense, the constant loss of fat in the body, in combination with a changeable and mostly irritable temperament, as well as problems related to the heart.
In the same way, it works in conjunction with growth hormone to achieve high body development, focusing mainly on the nervous system and the development of neurons, although the latter occurs only during pregnancy. The brain and reproductive organs could be affected if there are low levels of the chemical, a situation that worsens with short stature.
