Multiple choice

Which accurately describes the sodium-potassium pump?

  1. sodium ions move into the cell, potassium ion out

  2. sodium ions move out of cell, potassium ions in

  3. sodium and potassium ions move into the cell

  4. sodium and potassium ions move out of the cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sodium-potassium pump is an active transport mechanism that moves sodium ions out of the cell and potassium ions into the cell. It uses ATP to maintain the electrochemical gradient across the plasma membrane.

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