ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Thyroid follicles. Computer artwork of cells of thyroid follicles (pink, purple) superimposed on an artwork of the thyroid gland (red, centre). A thyroid follicle consists of a layer of epithelial cells (purple) around a central storage chamber (spaces). The cells produce the thyroid hormones tri-iodothyronin (T3) and thyroxine (T4) and secrete them into the central chamber where they are stored as the glycoprotein thyroid colloid (red). Thyroid hormones regulate the body's metabolism.
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