The T Thyrocytes Actively Transport ________ Ions into the Cell

Question

The T thyrocytes actively transport ________ ions into the cell from the interstitial fluid.
A) potassium
B) iodide
C) sodium
D) thymopoeitin
E) calcium

Accepted Answer

The T thyrocytes have a sodium-iodide symporter (NIS) on their basolateral membrane, which actively transports iodide ions into the cell from the interstitial fluid. Therefore, choice B (iodide) is the best answer. The other options (potassium, sodium, thymopoeitin, and calcium) do not play a direct role in thyroid hormone synthesis.