science
Grade-10
Easy
Question
Imagine that there are thirty sodium ions outside the cell and twenty potassium ions inside the cell. What will be the number of sodium and potassium after one cycle of the sodium-potassium pump?
- 28 sodium ions will be outside the cell and 17 potassium ions will be inside the cell.
- 32 sodium ions will be outside the cell and 23 potassium ions will be inside the cell.
- 33 sodium ions will be outside the cell and 22 potassium ions will be inside the cell.
- 27 sodium ions will be outside the cell and 18 potassium ions will be inside the cell.
Hint:
After a sodium-potassium pump, the number of sodium ions becomes 33 outside and the number of potassium ions becomes 22 inside the cell as it was 30 and 20 earlier.
The correct answer is: 33 sodium ions will be outside the cell and 22 potassium ions will be inside the cell.
- During each sodium-potassium pump, 3 sodium ions get out of the cell and 2 potassium ions get into the cell.
- If the cell has 30 sodium ions outside and 20 potassium ions inside the cell, it will gain 3 sodium ions outside and 2 potassium ions inside the cell after one cycle.
- So the number of sodium and potassium ions becomes 33 and 22 respectively after a pump.
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