Semi-Permeable Films is the lipid bilayer, on which is based the plasma layer that encompasses every natural cell. A gathering of phospholipids (comprising of a phosphate head and two unsaturated fat tails) organized into a twofold layer, the phospholipid bilayer is a semipermeable film that is particular in its porousness. The hydrophilic phosphate heads are in the outside layer and presented to the water content outside and inside of the cell.
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