At resting potential, the sodium-potassium pump moves
Answer and explanation
Correct answer: C. 3 sodium ions out and 2 potassium ions in
- Step 1: The pump uses ATP to move ions against gradients. Step 2. Three Na+ leave while two K+ enter, so the inside is negative at about -70 mV. Answer: 3 Na+ out, 2 K+ in. Why not the others: The pump ratio is fixed, and the interior stays negative.
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