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Home > All Images > 1991 > October > 9 Oct 1991

Images Dated 9th October 1991

Choose from 7 pictures in our Images Dated 9th October 1991 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Illustration of single thyroid follicle Featured 9 Oct 1991 Print

Illustration of single thyroid follicle

Illustration of a single human thyroid follicle, the functional unit of the thyroid gland. The follicle has been cut open to reveal the internal layer of epithelial cells surrounding a pool of thyroid colloid (purple). The blood supply is also featured (red & blue). The follicular cells secrete two forms of thryoid hormone, thyroxine (T4) and triiodothyronine (T3), which are stored in the jelly-like colloid. When actively secreting hormones the lining cells are large & cuboidal, & the colloid is diminished. When less active the colloid is distended & the secretory cells flattened