Video from Harvard Extension School on YouTube
5.8.1 Describe the phases of the action potential and the role of voltage-gated Na⁺ and K⁺ channels.
Why this video
This animation clearly demonstrates each stage of the action potential and illustrates how voltage-gated sodium and potassium channels govern membrane permeability changes.
Heads up
Standard neuron voltages (such as -70 mV resting potential) are typically shown rather than the Guyton conventions (-90 mV resting potential and -65 mV threshold), and the undershoot is termed hyperpolarization rather than positive afterpotential.
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