Fluid Mosaic Model: Understanding Cell Membrane Structure

Cell membranes are described as a 'fluid mosaic model' because they are composed of a fluid phospholipid bilayer with embedded proteins, forming a mosaic-like structure. The fluidity of the phospholipid bilayer allows for lateral movement of the phospholipids, giving the membrane a fluid-like consistency. The proteins embedded in the lipid bilayer are also mobile and can move within the membrane, contributing to the mosaic-like appearance. This fluidity and the diverse arrangement of proteins give cell membranes the ability to change shape, fuse with other membranes, and allow the movement of molecules and ions across the membrane.