Practice question · Select all that apply
Select every statement that is TRUE of the resting potential.
Hints
- Two options describe the pump and permeability wrongly - check the 3:2 ratio and the K+ vs Na+ leak.
- Equal permeability would push rest toward the midpoint, not near E_K.
Show the answer
- A. It is maintained by continuous active transport using ATP.
- C. The inside of the cell is negative relative to the outside.
- E. It sits close to the equilibrium potential for K+.
Why
Inside is negative, upkeep is active (ATP), and rest sits near E_K - all true. The membrane is NOT equally permeable (K+ leaks far more), and the pump's 3-out/2-in ratio DOES add charge (electrogenic), so those two are false.
Practise Resting Potential
The app has 5 more questions on this lesson, and keeps your place in the course. Psychology I is free to start.
More questions on Resting Potential
- Sort each ion by where it is more concentrated across the membrane of a resting neuron.
- A neuron at rest sits at about −70 mV. Why is the membrane NOT electrically neutral at rest?
- Trace WHY the inside of the resting neuron ends up negative. Put the causal steps in order.
- A neuron's potassium equilibrium potential is about −90 mV, yet the membrane actually rests at about −70 mV.…
- The sodium-potassium pump runs constantly in every neuron, and the brain spends a large share of its entire…