What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?
A. The cell continuously produces more ions to replace those moved by the pump, maintaining a constant supply.
B. Leak channels are always open, allowing the passage of sodium ions (Na+) and potassium ions (K+) across the membrane.
C. Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.
Answer: B
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