Answer:
Thyroglobulin
Step-by-step explanation:
The spherical arrangement of thyroid epithelial cells called thyroid follicles. These follicles are filled with proteinaceous substance that is the thyroid hormone precursor. These follicular cells are present within the thyroid gland located at the base of the neck and secretes hormones that maintains the metabolism.
Thyroid follicle cells produces the thyroglobulin that is the precursor of hormones, thyroxine (T4) and Triidothyronine (T3). Thyroglobulin stores in the lumen of thyroid follicles. Iodine play a crucial role in the formation of these hormones from the precursor. These hormones helps to regulate metabolism, heart rate and body's temperature.