Fluid-Mosaic Model

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•  Drawing of the fluid-mosaic model

Cell membranes are represented according to a fluid-mosaic model, due to the fact that they are:

  • Fluid – the phospholipid bilayer is viscous and individual phospholipids can move position
  • Mosaic – the phospholipid bilayer is embedded with proteins, resulting in a mosaic of components

Structure of the Plasma Membrane (Fluid-Mosaic)

fluid-mosaic 2d

Components of the Plasma Membrane

Phospholipids – Form a bilayer with phosphate heads facing outwards and fatty acid tails facing inwards

Cholesterol – Found in animal cell membranes and functions to improve stability and reduce fluidity

Proteins – May be either integral (transmembrane) or peripheral and serve a variety of roles


Fluid-Mosaic Model (3D)

fluid mosaic 3d