A cell membrane is very specific about what it allow to cross. how does this help the cell?
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Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly.
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The cell membrane is selectively permeable. It lets some substances pass through rapidly and some substances pass through more slowly but prevent other substances passing through it at all. Some small molecules such as water, oxygen and carbon dioxide can pass directly through the phospholipids in the cell membrane.
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