millyp05 (Posts 1) - 11/13/2009 5:25:10 PM

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I always get confused which ions move in and which ions move out. I understand what resting membrane potential is and the Nerst equations but when I do questions I get confused I always get the question wrong. When they give me Em of a cell and other ions I get confused what ions move out (and which one stay in) and vs. Can anybody explain this is lame terms for me please? Thanks in advance.

Aksh (Posts 1) - 11/13/2009 5:45:31 PM

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REMEMBER THE CHART I MADE:

Increase in Conductance Na Depolarization

K Hyperpolarization
Cl Hyperpolarization



Increase in Extracellular conc of Na Depolarization
K Depolarization


Cl Hyperpolarization.



Who flows in and who out.
1 compare potentials for two Ions.[Em and ion] say Who is Positive. ie -80 and -90 I think -80 is 10 MeV POSITIVE as compared to other. so it will move.
2 See if ur moving ion has positive charge or negative. Positives willmove as u think. negatives opposite.[if we have Em -70 and extracellular K -80 Em is positive. K will flow out to neutrilize it! if this Was Cl -80 since it has negative charge say that it will move inside.]


I know this is confusing but let me know if this helped u.

millyp05 (Posts 1) - 11/16/2009 7:09:54 PM

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Hello,
thanks for your explanations but I am still confused about it. I don't know what chat you have made and I dont know what do you mean by positive will move as you think and negative opposite. I will look for the answers somewhere else. Thanks anyways