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How is it that the intracellular levels ...

How is it that the intracellular levels of `K^+` are higher than extracellular levels in animal cells ?

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Ion pathways are controlled. They are either closed or open. `Na^+ , K^+` and ATPase can change polarity in cell membrane.
When `3Na^+` moveout from cell membrane `2K^+` enter inside. So negative charge is formed compared to outside so the layer is polarised. Due to this reason in cellular state proportion of `K^+` is more compared to outer state.
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