No, otherwise it would dissolve in the bodily fluids. It is semi-permiable though. This means that some things can pass through, but some can't.
Cell membranes are made up of a phospholipid bi-layer containing hydrophilic heads and hydrophobic tails. This is very important. (Look up phospholipid bi-layer and look at this structure.)
the outer layer
phospholipid bilayer and proteins.
Lipid layer
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