At the peak of the action potential, voltage-gated sodium channels open and voltage-gated potassium channels close. all voltage-gated channels close. all voltage-gated channels open. voltage-gated...

At the peak of the action potential, voltage-gated sodium channels open and voltage-gated potassium channels close. all voltage-gated channels close. all voltage-gated channels open. voltage-gated sodium channels close and voltage-gated potassium channels open. 2. After a stimulus results in initial depolarization of a region of cell membrane of a neuron, a threshold voltage is reached. Once this happens, which of the following takes place? A large number of voltage-gated sodium channels quickly open, causing a rapid change in membrane potential. A large number of voltage-gated potassium channels quickly open, causing a rapid change in membrane potential. Voltage-gated sodium and potassium channels quickly close, and recovery begins. Voltage-gated sodium channels quickly close, voltage-gated potassium channels open, and recovery begins.