Introduction to Psychobiology Day 4

Going and you get the action potential going o when

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going and you get the action potential going o When you have a critical mass of sodium channels opening Voltage gated potassium channels o Closed until the membrane reaches the right voltage At +40 mV, the peak of the action potential, the sodium channels close again As sodium channels open, the membrane becomes more positive As potassium channels open, the membrane becomes more negative Potassium channels are slow to close o Instead of returning to -65, the potassium ions keep leaving and it gets  a little to negative, a process which is called hyperpolarization Absolute refractory period The upshot  Time limit on how fast the cells can fire depending on how fast the channels  can close Electrical gradient Both positive ions So when the membrane is negative they want to come inside
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When the membrane is positive they want to get out Their electrical gradients should always be identical Their electrical force is driving them outside The concentration is always the same Depolarization
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