ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
THYROID
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Iron
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Iodine
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Sodium
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Calcium
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Detailed explanation-1: -The thyroid gland requires iodine to make thyroxine hormone.
Detailed explanation-2: -Thyroxine (tetraiodothyronine or T4) is formed from thyroglobulin by follicular cells. Follicular cells stimulated by TSH pinocytose thyroglobulin and transform it into T4 and, to a lesser extent, triiodothyronine (T3).
Detailed explanation-3: -Iodine is an essential trace element absorbed in the small intestine. It is an integral part of T3 and T4. Sources of iodine include iodized table salt, seafood, seaweed, and vegetables. Decreased iodine intake can cause iodine deficiency and decreased thyroid hormone synthesis.
Detailed explanation-4: -T3 and T4 are partially composed of iodine. A deficiency of iodine leads to decreased production of T3 and T4, enlarges the thyroid tissue and will cause the disease known as simple goitre.