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BIOLOGY
HOW SUBSTANCES GET INTO AND OUT OF CELLS
DIFFUSION

Molecules of gases, liquids and substances that are dissolved in liquids (e.g. sugars
dissolved in water) are free to move around. As a result of this movement, the molecules
spread themselves evenly to fill all the available space.







This process…

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Plant cell walls vary in their thickness and permeability but generally the thicker the cell wall
the slower the rate of diffusion.
The bigger the difference in concentration of a substance on either side of a membrane, the
faster it will tend to diffuse. The difference is called a DIFFUSION…

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