Cell membrane, illustration. The cell membrane is an elastic structure that separates the inner compartments and substances of a cell from the outer environment, and regulates the exchange of substances between the cell and the external space. The major components of all cell membranes are phospholipids, which form a lipid bilayer: water-soluble (hydrophilic) heads (round) form two hydrophilic surfaces, while the tails of the molecules form a hydrophobic layer inside the lipid bilayer.
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