Final answer:
After depolarization, the membrane repolarizes and restores to its resting state with the help of potassium channels and sodium-potassium ATPase.
Step-by-step explanation:
After depolarization, the membrane returns to its resting state, a process known as repolarization. During repolarization, voltage-gated sodium channels close, while potassium channels continue to have a 90% conductance. The resting state, characterized by a negatively charged inside relative to the outside, is restored due to the constant transport of ions by the plasma membrane sodium-potassium ATPase. The period required for the membrane to return to normal is called membrane recovery time.