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Which element is a key component of thyroid hormone?

Calcium

Iodine

Iodine is a key component of thyroid hormone, and its significance lies in the role it plays in the synthesis of thyroxine (T4) and triiodothyronine (T3), which are crucial hormones produced by the thyroid gland. These hormones are essential for regulating metabolism, growth, and development in the body.

Without sufficient iodine, the production of these hormones can be impaired, leading to various health issues, including hypothyroidism, characterized by symptoms such as fatigue, weight gain, and sensitivity to cold. Iodine deficiency can also lead to goiter, an enlargement of the thyroid gland.

In contrast, while calcium, iron, and sodium are important elements for various physiological functions in the body, they do not play a direct role in the formation of thyroid hormones. Therefore, iodine is the correct choice as a vital component of thyroid hormone production and function.

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Iron

Sodium

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