THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -As the sodium ion entry declines, the slow voltage-gated potassium channels open and potassium ions rush out of the cell. This expulsion acts to restore the localized negative membrane potential of the cell. Hyperpolarization is a phase where some potassium channels remain open and sodium channels reset.

Detailed explanation-2: -Depolarization also opens voltage-gated K+ channels, allowing K+ efflux, which, together with rapid Na+ channel inactivation, quickly repolarizes the membrane during the falling phase of the action potential. This enables the cell to propagate electrical signals quickly and with high efficiency.

Detailed explanation-3: -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.