Term
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Definition
| -70mV. This fluctuates up and down a little due to positive (mostly sodium) and negative (mostly chloride) ion channels opening when neurotransmitters released by adjacent neurons bind to the cell’s receptors. polarized |
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Term
| point of action potential that allows large voltage gated channels to open |
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Definition
| When more positively than negatively charged ions have entered the cell via small ion channels and the inner voltage of the cell is raised to -40mV, this happens |
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Term
| point of action potential that occurs as voltage gated channels open |
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Definition
| sodium literally pours in, the cell depolarizes and the spike we refer to as the action potential results |
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Term
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Definition
| neuron becomes increasingly and rapidly more positive |
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Term
| What ions are still entering and leaving the neuron while the action potential is occuring? |
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Definition
| potassium channels open and potassium ions leave the cell AND voltage-gated sodium channels still open, so sodium enters the neuron |
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Term
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Definition
| Voltage gated sodium channels close automatically and neuron cannot fire no matter how much stimuli is present |
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Term
| refractory period and potassium ions |
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Definition
Potassium ions continue to leave the cell, the cell starts to polarize,
Exiting Potassium channels close automatically when the cell charge reaches just below -70mV. |
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Term
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Definition
| re-establish the normal resting potential (since the cell now has lots of sodium inside and potassium outside, which is the opposite of the way it all started). expels approximately 3 sodium ions for every 2 potassium ions it pulls in. |
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Term
| picture of action potential |
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Definition
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Term
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Definition
| picture of action potential |
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