Iodine deficiency often results in goitre formation. This occurs due to the hypersecretion of which hormone? Select one: a. Thyroid stimulating hormone (TSH) b. Triiodothyronine (T3) c. Calcitriol d. Thyroxine (T4) e. Thyrotropin releasing hormone (TRH)
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The two main thyroid hormones are thyroxine (T4) and triiodothyronine (T3). When there is a deficiency of iodine, the thyroid gland cannot produce enough thyroid hormones. As a result, the pituitary gland secretes more thyroid stimulating hormone (TSH) to try to Show more…
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Iodine is necessary for the synthesis of thyroid hormones. These hormones help regulate metabolic reactions related to body temperature, resting metabolic rate, macronutrient metabolism, growth, and reproduction. Select the statement that correctly describes iodine deficiency. a. Iodine deficiency disorders generally do not cause brain damage. b. Goiter is always the result of an iodine deficiency. c. Goiter cannot be caused by excessive iodine intake. d. Cretinism can occur in an infant if a mother is deficient in iodine during pregnancy.
Adi S.
Which of the following contributes to the development of goiter? $a$. Inadequate iodine in the diet b. Autoimmune antibodies that stimulate the TSH receptor $c .$ Lack of feedback from circulating $\mathrm{T}_{3}$ and $\mathrm{T}_{4}$ $d$. Overproduction of thyroglobulin $e .$ All of the above
Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal? A) a disproportionate production of T3 to T4 B) hyposecretion of TSH C) hypersecretion of TSH D) hypersecretion of MSH E) a decrease in the thyroid secretion of calcitonin
Sri K.
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