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Question

Iodine is added to commercially prepared table salts to prevent deficiencies of this mineral. Which gland(s) require(s) iodine to function properly?

A
Parathyroids
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B
Pancreas
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C
Thyroid
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D
Ovaries and testes
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Solution

The correct option is C Thyroid
Thyroxine is the main hormone secreted by the thyroid gland into the blood stream. The thyroid hormones thyroxine and triiodothyronine are formed from the precursor protein thyroglobulin. Tyrosine residues on thyroglobulin are iodised to become mono or diiodotyrosine which combine in different combinations to form thyroxine and triiodothyronine. Deficiency of iodine affects the production of the thyroid hormones.

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