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Cell Membrane Fluid Mosaic Model: Cell membranes consist of a fluid formed by a phospholipid bilayer and a ?mosaic?, or patchwork, of proteins Phospholipid: Polar and hydrophilic head, nonpolar and hydrophobic fatty acid tail Cell membrane also called plasma membrane Outside the membrane there is interstitial fluid, which is a salty liquid Inside the membrane there is the cytosol, which is mostly water. The cytosol is also the water portion of the cytoplasm Phospholipid bilayer: Formed since the hydrophilic heads form hydrogen bonds with water, causing the heads to face the water on either side. Since the fatty acid tails are hydrophobic, they cluster together within the bilayer
