What is the main role of phospholipids?

Phospholipids play a crucial role in the formation and structure of cell membranes. Their unique composition, with hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails, allows them to arrange themselves into a bilayer. This bilayer is fundamental in creating a semi-permeable membrane that not only provides structural integrity to cells but also facilitates transport mechanisms. The flexibility of phospholipids contributes to the dynamic nature of the plasma membrane, allowing for the movement of proteins and lipids, as well as the process of endocytosis and exocytosis, enabling cells to communicate and exchange materials with their environment. Therefore, the primary function of phospholipids is associated with maintaining membrane integrity and facilitating transport activities within cells.