15. Action Potential Graph Phases

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7 Terms

1
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What event occurs at point 1 on the action potential graph?
Local potentials from ligand-gated Na+ channels
2
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What event occurs at point 2 on the action potential graph?
Threshold reached and voltage-gated Na+ channels open
3
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What event occurs at point 3 on the action potential graph?
Sodium entry causing depolarization
4
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What event occurs at point 4 on the action potential graph?
Na+ channels inactivate and voltage-gated K+ channels open
5
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What event occurs at point 5 on the action potential graph?
Potassium exit causing repolarization
6
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What event occurs at point 6 on the action potential graph?
Excess potassium exit causing hyperpolarization
7
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What event occurs at point 7 on the action potential graph?
Return to RMP via leak channels and pumps