The fixed pattern of changes in membrane potential during an action potential is coordinated by the sequential opening and closing of voltage-gated ion channels. Can you identify the status (open/closed) of the voltage-gated Na+ and K+ channels during each phase of an action potential?
a) resting potential Na+ channels are close, K+ channels are closed
b) rising potential Na+ channels open K+ channels closed
c) falling phase Na+ channels closed K+ channels open
d) undershoot Na+ channel closed K+ channels open
e) resting potential Na+ channels closed K+ channels closed