action potential Flashcards
1
Q
what is action potential
A
signal being send down a neuron
2
Q
- step
A
2 k+ move into cell
3 na+ move outside cell
establishes restimg membrane -70mV
3
Q
- step
A
positive signal from brain increases charge of cell to -55mV
when -55 is reached na+ channels open and na+ ions flood into cell
4
Q
- step
A
inside of cell switches polarity to +35 caused to open na+ channels
na+ channels close
k+ channels open
5
Q
- step
A
rush of k+ outside cell
returns voltage to negative
at -15 k+ channels close
6
Q
- step
A
positive signal reaches axon terminal
neurotransmitter is released and crossed post synaptic cleft
7
Q
hyperpolorication
A
-70 - -90
8
Q
desting potential
A
-70 before it jumps
9
Q
repolarization
A
+35 till -55
10
Q
depolarization
A
-55 till +35
11
Q
k+
A
potassium
12
Q
na+
A
sodium
