Channels Na+ K+ Making Axon Resting Open Voltage

not transmitting impulse so at resting potential, some K+ channels open but voltage gated Na+ channels closed

- energy of stimulus causes voltage gated Na+ channels to open, making membrane permeable to Na+ and so Na+ moves down electrochemical gradient, making inside axon less negative, this change in charge causes more Na+ channels to open

- Now p.d is at 40mV, so VGNa+ channels close and VGK+ channels open, so K+ diffuse out down electrochemical gradient, making inside axon more negative and eventually more negative than resting pot

- now VGK+ channels close, Na/K pump pumps Na+ out membrane and K+ into cytoplasm, so axon repolarised