Final answer:
The thyroid follicle contains hormones and other molecules made by the follicular cells. Parafollicular cells, also known as C cells, synthesize and secrete the hormone calcitonin.
Step-by-step explanation:
The thyroid gland is composed mainly of follicles, which are small clusters of cells surrounding a central cavity. The follicles store hormones and other molecules made by the follicular cells. Thyroid follicular cells are specialized in absorbing iodine from the blood to produce thyroid hormones. Parafollicular cells, also known as C cells, are scattered among the follicles and synthesize and secrete the hormone calcitonin.