How the action potential is created: Flashcards Preview

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Flashcards in How the action potential is created: Deck (4)
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1
Q

Prior to the action potential (during the resting potential):

A

1) Leakage K+ Channels let potassium out.
2) All Gated Na+ Channels are shut.
3) All Gated K+ Channels are shut.

2
Q

Gated sodium channels open, letting Na+ enter the cell. This causes the RP to change from -70 mV to +20 mV.

A

Depolarization Phase

3
Q

Gated sodium channels close. Gated potassium channels open, letting K+ exit the cell. This causes the AP to end—the voltage returns down to the RP (-70mV).

A

Repolarization Phase

4
Q

Gated K+ channels remain open, causing the RP to dip below -70 mV. This phase occurs because too much K+
leaves the cell.

A

Hyperpolarization

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