The thyroid is an endocrine (or hormonal) gland, located against the esophagus and which is schematically shaped like a bow tie. It is essentially made up of vesicles with walls made up of a single layer of cells, and which contain the colloid, mainly made up of thyroglobulin. The two hormones secreted by the thyroid gland are triiodothyronine (T3) and tetraiodothyronine (T4 or thyroxine)…
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