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Sodium-Potassium Exchange Pump (Quiz 2)

What is the purpose of pumping sodium and potassium across a membrane? The sodium potassium pump is a well understood example of active transport. Sodium and potassium ions are pumped in opposite directions across the membrane building up a chemical and electrical gradient for each. These gradients can be used to drive other transport processes. In nerve cells the pump is used to generate gradients of both sodium and potassium ions. These gradients are used to propagate electrical signals that travel along nerves. Therefore the action of nervous tissue requires ATP to generate resting potentials. Poisons that disable the pump prevent proper functioning of the nervous system.

View the animation below, then complete the quiz to test your knowledge of the concept.

1Which of the following statements are not true about the sodium potassium pump?
A)The ions from the intracellular fluid plus an ATP molecule bind to the carrier protein on the inside of the cell membrane.
B)ATP is broken down into ADP and potassium to supply the energy.
C)The carrier protein changes shape as it transports ions from the intracellular fluid to the extracellular fluid.
D)The ions from inside the cell are transported across the cell membrane.
E)The ions are then released into the extracellular fluid.

2Which of the following statements are not true about the sodium potassium pump?
A)After releasing ions into the extracellular fluid, the carrier protein exhibits a new conformation.
B)With this new conformation, the carrier protein can now bind to different ions in the extracellular fluid.
C)The ions in the extracellular fluid bind to the carrier protein, and the potassium attached to the carrier protein is released.
D)The carrier protein then changes shape again.
E)The ions from the extracellular fluid are then transported across the cell membrane to the inside of the cell.

3The sodium potassium exchange pump is an example of...
B)facilitated diffusion.
C)active transport.

4The sodium potassium exchange pump moves three potassium ions out of the cell and two sodium ions into the cell with each cycle.

5Active transport moves substances from an area of high concentration to an area of low concentration of that substance.

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