APFIVE Sodium-Potassium Pump Net Ion Flow
The sodium-potassium pump moves 3 Na⁺ ions out and 2 K⁺ ions in per cycle. If the pump cycles 1000 times per second, what is the net change in the number of ions moved from the intracellular space per second?
| Measurement | Ions per ATP Cycle |
|---|---|
| Sodium ions expelled (Na⁺) | 3 |
| Potassium ions imported (K⁺) | 2 |
A
There is a net movement of 1000 ions into the cell per second.
B
2000 ions are net moved out per second.
C
No net movement of ions occurs.
D
1000 ions are net moved out per second.
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