Term
| What happens with pm increases permeability to Na+? K+ |
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Definition
Membraine potential becomes more +, depolarization.
Membrane potential becomes more MP becomes more negative and is considered hyperpolarized. |
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Term
| What happens to permeability and polarization when there is an action potential created? |
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Definition
| Na+ permeability increased. This causes the MP to become more positive causing depolarization. |
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Term
| What are the phases of an action potential? |
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Definition
1. Depolarization (Na+ comes in) MP becomes more positive
2. Repolarization:
3. Hyperpolarization |
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Term
| What does the amplitude have to be to create an action potential? |
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Definition
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Term
| about how long (time wise) is an action potential? |
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Definition
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Term
| What initiates and action potential? |
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Definition
| a positive stimulus causes Na+ channels to open and some Na+ comes in. They get more channels open and K+ goes out as Na+ is coming in until there are enough for the AP to by big enough to call a success. |
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Term
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Definition
| threshold membrane potential: minimal MP depolarization needed to cause an action potential. The value is abou 55 mV and it works about half the time |
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Term
| How many proteins make up the Na+ K+ voltage gated channel? |
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Definition
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Term
| Why does Na+ influx start to decrease at the peak of the AP? |
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Definition
| high Na+ on the inside, as a result of the gates opening, causes there to be a decrease of the driving force. |
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