Thyroid gland, light micrograph

Thyroid gland, light micrograph

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Caption: Thyroid gland. Light micrograph of a section through a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells (dark blue), 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: x130 when printed 10 centimetres wide.

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Keywords: anatomical, anatomy, biological, biology, cell, colloid, cross-section, endocrinological, endocrinology, false-coloured, follicle, follicles, gland, histological, histology, hormonal, hormones, human body, light micrograph, light microscope, secretion, section, sectioned, slice, storage, t3, t4, thyroblobulin, thyroglobulin, thyroid, thyroid gland, thyroxine, transverse, tri-iodothyronine

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