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Hypothyroidism due to inadequate dietary iodine may present with all but Ans choice: A: goiter B:...

Hypothyroidism due to inadequate dietary iodine may present with all but Ans choice: A: goiter B: elevated TSH C: depressed T3/T4 D: depressed TSH.

Science   Anatomy-And-Physiology   
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Answer #1

Answer (d) depressed TSH

The production of thyroid hormones i.e T3 and T4 from the thyroid gland is regulated by the pituitary gland.

The pituitary releases thyroid stimulating hormone (TSH) according to the body's requirements which acts on the thyroid gland.

If there is occurence of hypothyroidism, the serum T3 and T4 levels will be low making the pituitary release more and more TSH to stimulate the underactive thyroid gland.

Hence if T3 and T4 are low, TSH levels will be high and vice-versa.

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