Most of the circulating T4 and T3 in the blood is
A) Free
B) Bound to album in
C) Bound to TBG (thyroxine binding globulin)
D) Bound to thyroxine binding prealbum in
E) Bound to the surface of red blood cells

Question

Quizplus · Accepted Answer

Most of the circulating T4 and T3 in the blood is bound to thyroxine-binding globulin (TBG), with only a small fraction existing in the free, or unbound, form.

Most of the Circulating T4 and T3 in the Blood