Iodine is
A)used by the adenohypophysis to synthesize TSH.
B)necessary for the synthesis of calcitonin by the thyroid gland.
C)necessary for the synthesis of thyroid hormones.
D)necessary for the synthesis of both PTH and calcitonin.

Question

Quizplus · Accepted Answer

Iodine is necessary for the synthesis of thyroid hormones, triiodothyronine (T3) and thyroxine (T4), by the thyroid gland. This is because iodine is required for the production of the amino acid tyrosine, which is an important component of thyroid hormones. The adenohypophysis synthesizes thyroid-stimulating hormone (TSH), not TSH itself, using iodine. Calcitonin is produced by the parafollicular cells of the thyroid gland and does not require iodine. PTH (parathyroid hormone) is produced by the parathyroid glands, not the thyroid gland, and also does not require iodine.

Iodine Is