Active thyroid follicles are lined by which type of epithelium?
Correct Answer: Cuboidal
Description: The thyroid follicle is the structural and functional unit of the thyroid gland. The thyroid gland stores its secretory substances in the lumina of follicles. These cyst-like structures, ranging from 0.2 to 0.9 mm in diameter, are composed of a simple cuboidal epithelium, composed of follicular cells surrounding a central colloid-filled lumen and contacting the colloid as well as parafollicular cells (clear cells; C cells) that are located at the periphery of the follicle and do not contact the colloid.Ref: Textbook of Histology, 4thedition; Chapter 13; Endocrine system; Page no: 355
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