Thyroid follicles, light micrograph

Thyroid follicles, light micrograph

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Caption: Thyroid follicles. Light micrograph of a section through a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells, which synthesise and secrete the iodine-containing hormones T3 (tri-iodothyronine) and T4 (thyroxine). The thyroid follicle is filled with a glycoprotein substance called thyroglobulin or thyroid colloid (red), which is a storage form of the thyroid hormones. When actively secreting hormones the lining cells are large and cuboidal, when less active the follicles are distended and the secretory cells flattened. Magnification: x440 when printed at 10 centimetres wide.

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Keywords: biological, biology, colloid, endocrinology, follicle, follicles, healthy, histological, histology, hormonal, hormone, light micrograph, light microscope, lm, mammal, mammalian, normal, secretion, section, sectioned, storage, t3, t4, thyroblobulin, thyroglobulin, thyroid gland, thyroxine, tissue, tri-iodothyronine

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