If the equilibrium potential for potassium is -94mV, the Vm of the cell is -70mV
ID: 3475693 • Letter: I
Question
If the equilibrium potential for potassium is -94mV, the Vm of the cell is -70mV, and the potassium is more concentrated inside the cell, which is true?
a. Since the Vm potential is normal, there is no net movement of ions.
b. The inside of the cell has more negative charge to prevent outward movement of potassium, so potassium is drawn into cell.
c. The inside of the cell has enough negative charge to prevent movement of potassium, so there is no net movement.
d. Since equilibrium potential is -94 mV, there needs to be more negative charge inside the cell than -70mV to prevent chemical deiving from from pushing potassium out of cell.
Explanation / Answer
Please find below Answer:
at the equilibrium potential for K+ = -94 mV, there is no net flow,the reason that the equilibrium potential is also called the reversal potential is because the direction of ion flow will be in opposite directions for potentials on either side of Erev,therefore, at -70 mV, the net flow of K+ will still be out
C. The inside of the cell has enough negative charge to prevent movement of potassium so there is no net movement.
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