Voltage Changes in Axons During Action Potential

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5 Terms

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Step 1

Resting state:

All gated ion channels are closed

Membrane at RMP (-70 mV)

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Step 2

Depolarizing phase:

Voltage-gated Na+ channels open

Sodium (Na+) carries + charges into cell

Continues until ~+35 mV

Negative (-) -> Positive (+) total charge

3
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Step 3

Repolarizing phase:

Gated Na+ channels close, gated K+ open

Potassium (K+) carries + charges out

Positive -> Negative total charge

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Step 4

"Undershoot"

Excess K+ enters

Hyperpolarization occurs

Charge drops to -72 mV

Negative -> more negative than usual

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Step 5

Return to resting state:

All gated ion channels have closed

Na+/K+ pump return ions to other side

Resting (-70 mV) state restored