Transmission of an Action Potential
- Created by: heatherbaker
- Created on: 04-03-16 15:14
View mindmap
- Transmission of an Action Potential.
- Saltatory conduction
- Myelinated Neurones
- Na+ and K+ can't diffuse through myelin sheath.
- Ionic movements occur at Nodes of Ranvier.
- In myelinated neurones local currents are elongated
- Ions diffuse from one node to the next.
- Action potential appears to 'jump'.
- Local Currents
- Non- Myelinated Neurones
- When action potential occurs Na+ channel opens at point in neurone.
- Allows Na+ to diffuse into neurone from high to low concentration.
- Movement of Na+ upsets balance of ionic concentration in neurone.
- Concentration in neurone rises at point where Na channels are open.
- Causes Na+ to diffuse sideways, away from the increased concentration.
- Movement of ions is a local current.
- Causes Na+ to diffuse sideways, away from the increased concentration.
- Concentration in neurone rises at point where Na channels are open.
- Movement of Na+ upsets balance of ionic concentration in neurone.
- Allows Na+ to diffuse into neurone from high to low concentration.
- Movement of ions is a local current.
- Saltatory conduction
Comments
No comments have yet been made