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In the cell membrane, hydrophilic heads orient to the inside and outside of the membrane, with the hydrophobic molecules inside. This gives the membrane its semi permeable fluid nature.he hydrophilic region in the cell is water-loving and it  attracts the water molecules. It is basically composed of polar  groups which readily dissolve and absorb water.
Phospholipids and glycolipids have amphipathic characteristics which enables them to form a micelle or a lipid bilayer. Due to the hydrophobic hydrocarbon tail and the hydrophillic polar head group, the lipids arrange in a form where the polar groups face water while the tail is away from water.