How do cell membranes form and what is their structure

The cell membrane consists of a phospholipid bilayer. Phospholipids are molecules with a hydrophilic (water loving) tail. And a hydrophobic (water repelling) tail. The cell environment contains a high proportion of water water molecules, this means that the hydrophilic heads face outwards to make contact with water, and the hydrophobic tails face inwards making contact with eachother. This results in two layers of phospholipids packed together, known as a bilayer, the overall structure with heads of the phospholipids facing the exterior or interior and the tails packing together within the membrane.