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This media file is a photograph of a textbook page, likely from a biology or anatomy textbook. The page is filled with text and two diagrams. One diagram, labeled "Figure 9.6 The position of the thyroid gland and its associated structures," is a detailed illustration of the human thyroid gland, trachea, and associated blood vessels and nerves in the neck. The other diagram, labeled "Figure 9.7 The microscopic structure of the thyroid gland," shows a close-up view of thyroid follicles and follicular cells. The text discusses the thyroid gland, its hormones (thyroxine and triiodothyronine), their synthesis, regulation, and effects on the body. It mentions iodine's role in hormone production, the stimulation of TSH secretion, and the physiological impacts of thyroid hormones on various bodily systems. Specific terms like "thyroglobulin," "TSH," "TRH," "goitre," and "calcitonin" are present. The page also includes a page number, "220," on the left side. The lighting suggests it is an indoor scene, likely a classroom or study environment. No people are visible in the image.
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