Action Potential Flashcards

1
Q

What happens when the Cl- equilibrium (reversal potential) is -85 mV and the channels open.

A

There is an influx of Cl- into the intracellular space

  • membrane potential decreases and moves towards -85mV
  • The cell is hyperpolarized
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2
Q

What happens when the Cl- reversal potential is -35 and the channels open?

A

There is an efflux of Cl- into the extracellular space

  • The membrane potential increases because of loss of anions and moves towards -35 mV (more positive)
  • The cell is depolarized
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3
Q

What happens if reversal potential of Na+ is +60mV and the channels open?

A

The Na+ ions move inside the cell towards the intracellular space

  • The membrane potential increases (larger plus inside the cell) towards +60 mV
  • The cell is depolarized
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4
Q

At rest (step 1), Na+ channels are ___ and K+ channels are Answer___

During the rising phase of the action potential (step 2), Na+ channels are ____ and K+ channels are ____

Once the membrane potential reaches around +40mV (step 3), Na+ channels are ____ and K+ channels are____

During the repolarization phase (step 4), Na+ channels are ____ and K+ channels are ____

During the hyperpolarization phase (step 4), Na+ channels are____
and K+ channels are ____

Reaching back the resting membrane potential (step 5) is achieved with ____
Na+ channels and ____ K+ channels.

A
Closed, Closed
Open, Closed
Closed, Open (reaching +40 mV)
Closed, Open
Open, Open (hyperpolarization step)
Closed, Closed
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