Nerve impulse transmission
Confused about nerve impulse transmission? Check out the following links:
- Review neuron structure
- Animation of nerve impulse transmission (shown in class)
- Good explanation of the phenomenon
- Saltatory conduction vs transmission in unmyelinated axons (shown in class)
- Communication at the synapse (shown in class)
- Another animation on synaptic transmission (slightly more detailed)
Diagram from (http://en.wikipedia.org/wiki/File:Action_potential_vert.png).
Posted on 15 January 2009, in nervous system and tagged nerves, nervous system. Bookmark the permalink. 4 Comments.
can you tell me how the recovery period and repolarization start in nerve impulse
Repolarization is the second phase of the Action Potential (after the sodium move in and making the membrane potential more positive due to sodium channels opening).
The potassium ions are positively charged, the K+ want to rush out, this can only be done if voltage-gated potassium channels need to open. (the membrane is positive enough to open these voltage-gated potassium ions due to sodium making it positive).
This makes the Potassium go out, it wants the charge across the membrane to be negative which is Repolarisation.
I drew this picture – and posted it on Wikipedia – while you are free to use it, how about crediting the source? – the article on Action Potentials in Widipedia.
Thanks very much for the reminder.