Test: MCAT Biology

12.

How does the sodium-potassium pump accomplish its function of maintaining the electrochemical potential across a cell membrane?

It actively moves three sodium ions out of the cell and two potassium ions in, both against their concentration gradients

It passively moves three sodium ions out of the cell and two potassium ions in, both along their concentration gradients

None of these answers are correct

It passively moves three sodium ions out of the cell and two potassium ions in, both against their concentration gradients

It actively moves two sodium ions out of the cell and three potassium ions in, both against their concentration gradients

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