In some biological membranes the lipid bilayer contains phospholipids, each with a head and two fatty acid tails.Phospholipid molecules are typically arranged so that the

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In a lipid bilayer, the hydrophilic head of the phospholipid faces outward, interacting with the aqueous environment of the cell's exterior and interior, while the hydrophobic tails face each other to form a nonpolar region in the center of the bilayer. Therefore, the fatty acid tails point toward each other.

In Some Biological Membranes the Lipid Bilayer Contains Phospholipids, Each