Q. Regarding the “iodide pump” in thyroid cells, which is NOT true? (Solved)
1. it is stimulated by TSH
2. it depends on Na+ / K+ ATPase activity
3. it pumps iodide into the colloid, after entering the cell down an electrical gradient
4. it pumps iodide against an electrical gradient
5. its activity can be measured with trace doses of radioactive iodine
- c. it pumps iodide into the colloid, after entering the cell down an electrical gradient