Which of the following is essential for the synthesis of thyroxin? (1) Potassium (2) Sodium (3) Calcium (4) Iodine

Which of the following is essential for the synthesis of thyroxin? (1) Potassium (2) Sodium (3) Calcium (4) Iodine
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(4) Iodine Explanation: Iodine is essential for the synthesis of Thyroxine, one of the two major hormones secreted by the thyroid gland. Thyroxine is formed by the molecular addition of iodine to the amino acid tyrosine while the latter is bound to the protein thyroglobulin.
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