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Home > All Images > 1994 > April > 21 Apr 1994

Images Dated 21st April 1994

Choose from 9 pictures in our Images Dated 21st April 1994 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Illustration of follicles in the thyroid gland Featured 21 Apr 1994 Image

Illustration of follicles in the thyroid gland

Thyroid gland. Illustration of the microscopic cell structure of the human thyroid gland, with an outline of the whole gland superimposed. The white outline (at centre) represents the shape of the thyroid gland, located in the neck. Its cellular structure (background) consists of round follicles which produce thyroid hormone. Cut through, the follicles are composed of cuboidal epithelial cells (purple) which secrete hormones (light blue) into a central storage chamber. Each follicle is surrounded by a network of blood capillaries (red) which transport secreted thyroid hormone in the blood to the rest of the body. Nerves are yellow. Thyroid hormones control metabolism and growth