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Cell Function (3)

Diffusion and Osmosis.

What is Diffusion? Diffusion is the movement of molecules so they mix.
Which way do molecules move during the process of Diffusion? Molecules move with the concentration gradient during Diffusion (they move from an area of high concentration to an area of low concentration.)
Does Diffusion require energy? No
What is Osmosis? Special kind of Diffusion. Water molecules move through across plasma membrane. Occurs when a membrane has tiny holes which let water molecules pass through but not larger molecules (eg. sugar). A membrane like this is called semi-permeable.
What is a semi-permeable membrane? Only some substances can pass through it.
Which way do water molecules move during the process of Osmosis? With the concentration gradient (from an area of high concentration to an area of low concentration).
Does Osmosis require energy? No
Created by: zarap103