In each cycle, the sodium-potassium pump of an axon moves
A3 K+ out for 2 Na+ in
B2 Na+ out for 2 K+ in
C2 Na+ out for 3 K+ in
D3 Na+ out for 2 K+ in
Answer & Solution
Correct answer: D. 3 Na+ out for 2 K+ in
The pump expels three sodium ions for every two potassium ions it brings into the cell.
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