In a single sodium-potassium pump cycle, ATP is used with the result that
A. 3 sodium ions enter and 2 potassium ions leave.
B. 2 sodium ion enters and 1 potassium ion leaves.
C. 3 sodium ions leave and 2 potassium ions enter.
D. sodium and potassium ions enter and water leaves.
E. 2 sodium ion leaves and 1 potassium ion enters.
Answer: C
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