Transmission of Action Potentials Flashcards
1
Q
what is the movement of ions called?
A
local current
2
Q
What is the 1st stage of local current transmission?
A
- stimulus causes Na channels to open
- Na ions diffuse into neurone
Causing action potential to be generated
3
Q
What does the Na ions diffusing into the neurone do?
A
disrupt the resting potential ion balance
4
Q
What is the 2nd stage of local current transmission?
A
- high concentration of Na where it entered
low concentration to the side - high concentration causes ions to diffuse sideways towards negative/resting area (depolarises the region)
5
Q
What is the 3rd stage of local current transmission?
A
diffusion will continue along the neurone
6
Q
What is a refractory period?
A
prevents Na diffusing left
ensures impulses are separated
passing in 1 direction along axon
7
Q
What cannot be generated in a refractory period?
A
impulse
8
Q
why cant an impulse be generated in a refractory period?
A
because sodium voltage gated channels close
