In human physiology, which mineral is required for the synthesis of thyroid hormones triiodothyronine () and thyroxine ()?
Answer and explanation
Correct answer: A. Iodine
- Step 1: Thyroid follicular cells actively trap circulating iodide to iodinate tyrosine residues on thyroglobulin, synthesizing and . Answer: Iodine. Why not the others: Iron is central to heme in hemoglobin; calcium regulates neuromuscular signaling.
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