Given the following possible steps in a sequence, which is the correct path of iodide ions (I-) "trapped" by follicular cells of the thyroid?
1. Attached to TGB proteins in the colloidal lumen of the follicle
2. Absorbed back into the apical side of follicular cells, as T3 and T4, via endocytosis
3. Transported from the apical side of follicular cells into the follicular lumen
4. Transported from the blood into the basal side of follicular cells
5. Transported from the basal side of follicular cells into the blood in the form of T3 and T4 and bound in the blood to TGB
6. Transported from the basal side of follicular cells to the apical side of the follicular cell
Group of answer choices
4, 6, 3, 1, 2, 5
6, 4, 2, 1, 5
5, 2, 3, 1, 4, 6
4, 6, 3, 2, 1, 5
1, 6, 4, 3, 5, 2