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Old 07-14-2013
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Question General question about ionic equilibrium

Lets say the Membrane Potential is -70mv. And lets say the Equilibrium Potential for an ion X, is -90mv

So Lets assume the membrane has ungated channels for X, we know that the ion will Efflux. so the change in Membrane Potential will approach -90mV


But what if we increased the extracelluar concentration of ion X. would doing this, also change the Equlibrium Potential for ion X????
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Old 07-15-2013
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Quote:
Originally Posted by ReggieMiller View Post
Lets say the Membrane Potential is -70mv. And lets say the Equilibrium Potential for an ion X, is -90mv

So Lets assume the membrane has ungated channels for X, we know that the ion will Efflux. so the change in Membrane Potential will approach -90mV


But what if we increased the extracelluar concentration of ion X. would doing this, also change the Equlibrium Potential for ion X????
Yes, the EP for the ion x would change , and the efflux of ion would stop or even if there is more ion out side influx of ion would occur until and equilibrium is reached
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Old 07-15-2013
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Correct Answer

Equilibrium potential depends on the ratio of concentration of X extracellular to intracellular according to nernst equation. So, when the conc changes, EP will change and it will depend upon the new EP whether influx or efflux will occur.

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