Final answer:
In the thyroid gland, ions are absorbed from the bloodstream and become bound to tyrosine residues within a polypeptide called thyroglobulin. The more active hormone produced from this process is called T3.
Step-by-step explanation:
In the thyroid gland, ions are absorbed from the bloodstream and diffuse through the follicle cells into a central cavity and become bound to tyrosine amino acid residues within a polypeptide called thyroglobulin. The more active hormone produced from this process is called T3.