4 lines
881 B
Markdown
4 lines
881 B
Markdown
A key concept from the video "The Action Potential" is how an impulse travels down an axon within a neuron. Initially, the voltage across the membrane is about -70mV. The impulse begins when potassium ions begin to leave the axon, and sodium ions enter. Then, once the potential approaches -55mV, sodium voltage gated channel open up, allowing sodium ions to rush into the axon, causing depolarization. As the voltage reaches 30mV, the sodium channels close and potassium voltage gated channels open. The potassium voltage-gated channels allow potassium ions to rush out of the cell, initiating repolarization. Importantly, for the signal to travel along the axon, the depolarization of one section initiates the depolarization of the next section in one direction.
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Once the sodium ions enter the cell and the potassium ions leave, how does the system reset to its initial state?
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