APFIVE Potassium Ion Electrochemical Gradient
A cell has an internal K+ concentration of 140 mM and is placed in a solution with an external K+ concentration of 5 mM. If the cell’s membrane potential is -70 mV, which of the following statements correctly describes the net movement of K+ ions?
A
K+ movement will require ATP hydrolysis in both directions
B
K+ will not move as it is already at electrochemical equilibrium
C
K+ will passively exit until electrochemical equilibrium is reached
D
K+ will actively enter the cell against its concentration gradient
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