Light micrograph of a section of a human thyroid gland showing the functional units,the thyroid follicles. These units are lined by a single layer of epithelial cells (blue edges round orange areas),which synthesize & secrete the iodine- containing hormones T3 & T4. The thyroid follicle is filled with a glycoprotein substance called thyroglobin or thyroid colloid,which is a storage form of the thyroid hormones (orange). When actively secreting hormones the lining cells are large & cuboidal,& the colloid is diminished. When less active (here) the follicles are distended & the secretory cells flattened. Magnification: x18 at 6x6cm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burbidge, John |
Bildgröße: | 3401 px × 3437 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |