For each ATP molecule used, how does the sodium-potassium pump move ions?
Correct answer D. 3 Na⁺ out of the cell and 2 K⁺ into the cell
Explanation
The Na⁺/K⁺-ATPase pumps three sodium ions out and two potassium ions in per ATP hydrolysed. This unequal exchange helps build the resting membrane potential.
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