Q: dendrites/gates

Kalman Rubinson kr4 at nyu.edu
Tue Mar 22 15:17:08 EST 2005


On Tue, 22 Mar 2005 13:18:19 -0500, Joseph Legris
<jalegris at xympatico.ca> wrote:

>Kalman Rubinson wrote:
>> On Mon, 21 Mar 2005 11:06:57 -0500, Joseph Legris
>> <jalegris at xympatico.ca> wrote:
>> 
>> 
>>>Kalman Rubinson wrote:
>>>
>>>>Well, another nit to pick is that the existence of a slightly
>>>>decremented potential (such as the AP) at the internodal region
>>>>requires neither transmembrane currents or membrane excitation, only a
>>>>potential difference (which does exist).
>>>>
>>>>Kal
>>>
>>>Yes, but in a conducting medium, potential difference == current flow.
>> 
>> 
>> But not between the inside and outside of an internodal region.
>> 
>> Kal
>> 
>
>O.K. but your statement above reduces to:
>
>"the existence of a slightly decremented potential at the internodal 
>region requires ... only a potential difference (which does exist).
>
>What then is the cause of the decrement to the action potential between 
>nodes?

Longitudinal resistance and charging of the (small) membrane
capacitance.  

Kal



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