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how does water pass through the cell membrane?!

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    hi

    i understand that the tails of the phospholipids are hydrophobic and form a barrier to water soluble substances (and supposedly not to water? ), therefor how can water pass though what is effectively a layer of oil? does water enter through channel proteins? can water pass through the cell membrane as it is a smaller molecule than say a substance that is dissolved in it?

    i am frustratingly confused.
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    Water passes in the majority through channel proteins called aquaporins. A small amount can pass through the phospholipid bilayer.
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    (Original post by Barry Chuckle)
    hi

    i understand that the tails of the phospholipids are hydrophobic and form a barrier to water soluble substances (and supposedly not to water? ), therefor how can water pass though what is effectively a layer of oil? does water enter through channel proteins? can water pass through the cell membrane as it is a smaller molecule than say a substance that is dissolved in it?

    i am frustratingly confused.
    Thats the one I think.
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    http://en.wikipedia.org/wiki/Aquaporin
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    yeah, Osmosis!! hehe xD

    der are a lot of different terms used though, depending on whether ur referring to water transport in animals or plants.
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    (Original post by James G)
    http://en.wikipedia.org/wiki/Aquaporin
    thank you very much!
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    osmosis, just simple diffusion me thinks... glad to see that at A in A level Biology is coming in handy.... :p:

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