A voltage difference is maintained across the plasma membrane. This voltage difference A) is positive on the inside of the cell relative to the outside. B) does not require energy to generate and maintain. C) arises because the sodium-potassium pump pumps 2 Na⁺ in and 3 K⁺ out during one catalytic cycle. D) arises because the sodium-potassium pump pumps 2 K⁺ in and 3 Na⁺ out during one catalytic cycle. E) arises from secondary active transport.

Question

Quizplus · Accepted Answer

The sodium-potassium pump actively transports 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell, creating a voltage difference with the inside of the cell being negative relative to the outside.

A Voltage Difference Is Maintained Across the Plasma Membrane