EVERYDAY SCIENCE

Detailed explanation-1: -Repolarization is a stage of an action potential in which the cell experiences a decrease of voltage due to the efflux of potassium (K+) ions along its electrochemical gradient. This phase occurs after the cell reaches its highest voltage from depolarization.

Detailed explanation-2: -With repolarization, the potassium channels open to allow the potassium ions (K+) to move out of the membrane (efflux). As this happens, the electrical potential gradually becomes more negative inside the nerve cell until the original resting potential of-70 mV is attained again.

Detailed explanation-3: -The return of the membrane potential to the resting potential is called the repolarization phase.

Detailed explanation-4: -As an action potential travels down the axon, there is a change in polarity across the membrane. Repolarization occurs when the K+ channels open and K+ moves out of the axon. This creates a change in polarity between the outside of the cell and the inside.