Action Potential Flashcards
a voltage difference across the membrane of -70 mV
Resting potential
There is always more what OUTSIDE the cell?
Na+
There is always more what INSIDE the cell?
K+
Describe a Na+/K+ pump
2 K+ in
3 Na+ out
SHORT-distance signals within a neuron
Graded potential
LONG-distance signals within a neuron
Action potential
the membrane becomes LESS polarized; open more Na+ channels
ex. -70 to -60
Depolarization
the membrane becomes MORE polarized; open more K+ channels
ex. -70 to -80
Hyperpolarization
30 mV
Action potential
-55 mV
Threshold stimulus
movement of the membrane potential to the initial resting (polarized) state
Repolarization
caused by Na+ flowing into the cell
Depolarization
caused by K+ flowing out of the cell
Repolarization
caused by K+ continuing to leave the cell
Hyperpolarization
