lipid membranes

Lipid membranes are thin layers made primarily of special molecules called lipids, which have a water-loving head and water-hating tails. These molecules arrange themselves into a double layer, called a bilayer, with the tails facing inward and the heads facing outward, creating a flexible barrier. This membrane surrounds cells and organelles, controlling what enters and exits, and providing structure. It also contains proteins that help with communication, transport, and signaling, making it a dynamic, selective boundary essential for life.