The Nerve Impulse (AQA A-Level Biology): Flashcards

Self-propagating electrical wave along axon membrane

$-65$ mV

$+40$ mV

3 $\text{Na}^+$ out : 2 $\text{K}^+$ in

Membrane becomes positive (during action potential)

Membrane returns to negative

Inside becomes more negative than resting potential

Sodium voltage-gated channels

1-2 milliseconds

Oscilloscope (with electrodes)