Phospholipids have a hydophyllic head (LOVES WATER) and a hydrophobic tail (HATES WATER).
Therefore, a bilayer is formed with the heads facing outwards either side of the membrane.
Because the tails are located in the centre, the centre part of the membrane does not allow water-soluble substances to diffuse through it.
However, small non-polar substances can diffuse through it.
WATER SOLUBLE SUBSTANCES : Ions and polar molecules
EG. NON POLAR SUBSTANCE : Carbon dioxide
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