Ion acccount in neuron after firing

[sweet springs]

Hi.

I am learning how neuron transmit current. I am wondering after firing sodium ions are rich and potassium ions are poor in neuron cell. How ion concentrations come back to the original states before firing?

Thanks for your help in advance.

 

[atyy]

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/nakpump.html

It takes many action potentials to deplete ion concentrations to the extent the action potentials change their shape. This can be estimated from experimets in which the sodium-potassium pump is poisonsed, and the cell made to fire action potentials.

 

[sweet springs]

Thanks atvy.
Your animations together with http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html
mean that there are three channels so to say potassium, sodium and potassium-sodium. The first two are players of firing and the last one reset the neuron ion concentration. Do I understand right?
Regards.

 

[atyy]

Thanks atvy.
Your animations together with http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html
mean that there are three channels so to say potassium, sodium and potassium-sodium. The first two are players of firing and the last one reset the neuron ion concentration. Do I understand right?
Regards.

Yes. There are many other channels that vary from neuron to neuron, but you have the general picture right.

 

[sweet springs]

atvy, thanks a lot.