The transport of iodide from the blood into the thyroid follicular cell occurs via the Sodium-Iodide Symporter (NIS). This is an example of which transport process?
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Correct answer: Secondary active transport
The NIS utilizes the sodium gradient created by the Na+/K+ ATPase (primary active transport) to move iodide against its electrochemical gradient. This makes it a classic example of secondary active transport.
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