nerve impulse Flashcards
resting potential: Na+ voltage-gated channels are ____
closed
resting potential: Na/K pumps remove what for what?
remove 3 Na for every 2 K they allow in
resting potential: K+ volted-gated channels are ____
closed, but leak
resting potential charge:
-70mV on the inside of the cell
resting potential: the membrane is ____
polarized
threshold potential: is an ____ response
all or nothing
threshold potential: voltage of stimulus needed to create an action potential
-55mV
beginning of action potential: Na+ gated channels ____
open
beginning of action potential: K+ gated channels ____
stay closed
beginning of action potential: the charge ____
reverses
beginning of action potential: the membrane is ____
depolarized
beginning of action potential: charge reaches ____
+35mV
end of action potential: Na+ gated channels ____
close
end of action potential: K+ gated channels ____
open, and K+ escapes to the outside of the neuron
end of action potential: the cell begins to ____
repolarize
repolarization: the internal voltage ____
returns to -70mV
repolarization: because the Na/K pumps continue to work, ____
a short overshoot period occurs where voltage drops to below -70mV
repolarization: the K+ channels ____
close, and the cell is polarized
