Action Potential Flashcards
What happens when the Cl- equilibrium (reversal potential) is -85 mV and the channels open.
There is an influx of Cl- into the intracellular space
- membrane potential decreases and moves towards -85mV
- The cell is hyperpolarized
What happens when the Cl- reversal potential is -35 and the channels open?
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
What happens if reversal potential of Na+ is +60mV and the channels open?
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
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.
Closed, Closed Open, Closed Closed, Open (reaching +40 mV) Closed, Open Open, Open (hyperpolarization step) Closed, Closed