Membrane Permeability + Transport Proteins

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Gejo992
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#1
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Hi, I'm stuck with what membrane permeability is and how the presence of transport proteins affects it. Could anyone explain please??

So with something like ions, I know that membranes are essentially impermeable to them, but if a membrane has channel proteins and/or carrier proteins for a specific ion eg: Na+ does it become permeable to the ion or is it still considered as impermeable?
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Tris Foster
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#2
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I think it makes the membrane permeable to them because if it was still impermeable to the ions, for example, they wouldn't be allowed to get through. So yes, the channel protein do make it permeable
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gladheateher
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#3
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(Original post by Gejo992)
Hi, I'm stuck with what membrane permeability is and how the presence of transport proteins affects it. Could anyone explain please??

So with something like ions, I know that membranes are essentially impermeable to them, but if a membrane has channel proteins and/or carrier proteins for a specific ion eg: Na+ does it become permeable to the ion or is it still considered as impermeable?
When we say the membrane becomes permerable to the ion, we don't mean the ion can pass through the membrane itelf i.e. through the phospholipid layer, but rather that it passes through the carrier proteins. The more carrier proteins we have the more ions that can pass through per unit area per unit time which is essentially what the membrane being more permeable to ions means.
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Frank Peters
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#4
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in addition to the top aswell, if were talking about action potentials and how impulses get started, the channel protein can close and open depending on the situation
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Gejo992
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#5
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So to apply that to the electron transport chain, when H+ ions are pumped across the membrane to create a proton gradient and the gradient is maintained by the impermeability of the membrane to H+ ions.

How come the membrane is impermeable to H+ ions if they are able to be pumped across it?
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