In the blood, A) most T₃ and T₄ molecules are found bound to thyroxine-binding globulin (TBG). B) T₃ and T₄ are rapidly metabolized. C) T₃ is converted into T₄. D) T₃ but not T₄ is bound to TSH. E) most thyroid hormones are transported in a free form.

Question

Quizplus · Accepted Answer

Most thyroid hormones (T3 and T4) in the blood are bound to thyroxine-binding globulin (TBG), with only a small fraction circulating in a free form.

In the Blood