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Endocrine functions of Thyroid gland are regulated by anterior pituitary
TSH (thyroid stimulating hormone
) is a hormone secreted by anterior pituitary gland.
It stimulates thyroid gland to produce triiodothyronine
(T-3) and thyroxine
When T-3 & T-4 level in the body are low, anterior pituitary secrets more TSH to stimulate thyroid gland to produce more T-3 & T-4.
Thus as soon as you your Serum levels of T-3 and T-4 become normal due to oral thyroxine intake, your serum TSH level
will become normal.
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