to determine whether pituitary thyrotropin ( tsh ) responsiveness to thyrotropin-releasing hormone ( trh ) is enhanced by small decreases in serum thyroxine ( t4 ) and triiodothyronine ( t3 ) , 12 euthyroid volunteers were given 190 mg iodide po daily for 10 days to inhibit t4 and t3 release from the thyroid .
C0032002
pituitary
C0040162
thyrotropin-releasing hormone