Which endocrine gland requires iodine to synthesize a particular hormo

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Which endocrine gland requires iodine to synthesize a particular hormone whose deficiency may cause goitre disease ?

Hypothalamus
Pancreas
Thymus
Thyroid gland
This question was previously asked in
UPSC NDA-1 – 2015
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The thyroid gland is an endocrine gland located in the neck that produces thyroid hormones.
Thyroid hormones (thyroxine and triiodothyronine) contain iodine atoms. Iodine is an essential micronutrient required for the synthesis of these hormones. A deficiency of iodine leads to insufficient production of thyroid hormones, which in turn causes the thyroid gland to enlarge, a condition known as goitre, in an attempt to compensate and produce more hormones.
The hypothalamus is part of the brain and controls the pituitary gland, which in turn regulates the thyroid. The pancreas produces insulin and glucagon (regulating blood sugar). The thymus is involved in immune system development. Only the thyroid gland directly synthesizes hormones requiring iodine, whose deficiency causes goitre.

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