Thyroid Follicles, LM

Thyroid Follicles, LM

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Credit: BIOPHOTO ASSOCIATES/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells (dark purple, dark nuclei), which synthesize 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 (purple), 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, biological, biology, cell, colloid, cross-section, endocrinological, endocrinology, follicle, gland, histological, histology, hormonal, hormones, light micrograph, light microscope, lm, secretion, section, slice, t3, t4, thyroglobulin, thyroid, thyroid gland, thyroxine, tri-iodothyronine

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