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8 Cards in this Set
- Front
- Back
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Whats an ion channel?
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It's a path in the neuron cell membrane where ions can pass.
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What does the "pump" do?
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It moves three sodium ions out of the neuron and two potassium ions are put in.
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What's a resting potential?
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This is when the inside of the neuron is negative and the outside is positive. The negative part has more potassium than the outside and the outside has more sodium ions than the inside.
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What's the resting membrane potential?
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It lies on about -70mV.
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What's an action potential?
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An action potential is when a neuron gets intensively stimulated (heat, light, sound etc..) When the resting potential reaches about -55.
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What's depolarization?
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When stimulus causes a gate in the Sodium, Na+ Channel to open and Sodium starts to flow inside. The electrical potential changes to ~+40mV.
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What's repolarization?
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Depolarization causes the K+ Channel gate to immediately open. K+ diffuses out of the neuron and the initial electrical potential is restored. -70mV.
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What's refractory period?
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This lasts 1msec and disables the Na+ & K+ channel to be able to respond to stimulus. The pump pumps Na+ out and K+ in to reestablish the inital ion distribution.
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