Thyroid gland

Thyroid gland

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Credit: DR GARY GAUGLER/SCIENCE PHOTO LIBRARY

Caption: Thyroid gland. Coloured light micrograph (LM) of a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells (purple, dark nuclei), 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 (grey), 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.

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Keywords: anatomical, anatomy, biological, biology, cell, colloid, coloured, endocrinological, endocrinology, false-colour, false-coloured, follice, follicles, gland, histological, histology, hormonal, hormones, light micrograph, light microscope, secretion, storage, t3, t4, thyroblobulin, thyroid, thyroid gland, thyroxine, tri-iodothyronine

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