Answer:
The thyroid gland is composed of thyroid follicles, which are small spherical structures that produce and store thyroid hormones. Each thyroid follicle is made up of a single layer of follicular cells that surround a central cavity filled with colloid.
Follicular cells are the cells that make up the wall of the thyroid follicle. These cells are responsible for the production and secretion of thyroid hormones, which are essential for regulating metabolism and growth and development.
Thyroid follicles, on the other hand, refer to the structural unit of the thyroid gland, consisting of a single layer of follicular cells surrounding a central cavity filled with colloid. The colloid is a gel-like substance that contains a high concentration of thyroid hormones, which are stored within the follicle until they are needed.
In summary, follicular cells are the cells that make up the thyroid follicle, while the thyroid follicle is the structural unit of the thyroid gland that contains the follicular cells and the colloid.