ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Thyroid gland. Computer artwork of a thyroid gland (red, centre), superimposed on an image of cells of thyroid follicles (green, blue). Thyroid follicles consist of a layer of epithelial cells (purple) around a central storage chamber (spaces). The cells produce the thyroid hormones tri-iodothyronine (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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