angelaysha890
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Permeability is the condition of being capable of having materials flow into and out of a membrane. The permeability of a cell membrane is determined by how easily a molecule can diffuse across the membrane. Usually, only molecules that are fat-soluble can permeate across a cell membrane. Why is this the case?

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thisisbenmanley
The cell membrane is composed of something called a lipid bi-layer (a double layer of a molecule called a lipid).

A lipid is a type of fat; therefore, if a molecule is fat-soluble, the lipids of the lipid bi-layer of the cell membrane will allow it to pass through.
MyLittleMonster11038

Cell membranes are composed of a lipid bilayer.

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