Psychology / Unit 2 Psych 0155 short lesson, about 20 seconds
The Action Potential
Captions available
The idea
The action potential is the rapid electrical spike that travels down the axon once the threshold of excitation is crossed.
In practice
Sodium floods into the axon, the charge spikes positive, and the spike sweeps toward the terminal buttons.
Where people slip
The action potential does not travel like electricity in a wire. It is regenerated at each point along the axon.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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