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Thyroid gland

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REGULATION OF THYROID HORMONE SECRETION<br />

* Hypothalamo-hypophyseal-thyreoid axis<br />

* Extrathyroid metabolism of thyroid hormones –<br />

activation of T 4 to T 3 (inactivation to rT 3 )<br />

Deiodase-Isoenzymes<br />

* dietary uptake of iodine – iodine metabolism

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