- Phospholipids consist of a hydrophillic phosphate head and a hydrophobic fatty acid tail
- Phospholipids can form bilayers, with one sheet of phospholipid molecules, opposite another
- The inner layer of the phospholipid bilayer has its hydrophillic heads pointing in, towrads the cell and interacts with the water in the cytoplasm
- The outer layer of the phospholipid bilayer has its hydrophillic head pointing outwards, interacting with the water surrounding the cell
- The phospholipid bilayer allows lipid-soluble molecules across, but not water-soluble molecules. This is because the phospholipid bilayer is hydrophobic so lipid-soluble molecules move through the membrane more easily than water-souble molecules
- The phospholipid bilayer acts a barrier to large charged molecules such as glucose and ions. It is freely permebale to non-charged molecules and very small polar molecules.
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