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Unit 3
Exchange of Materials
5
Biology
12th Grade
04/09/2013
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Term
What does partially permeable mean?
 Definition
Membranes that do not let all types of particles through.
Term
Define diffusion
 Definition
Movement of any particles from a region of high concentration to a region of low concentration.
Term
Define Osmosis
 Definition
Only refers to movement of water molecules
Term
How does active transport differ from diffusion and osmosis?
 Definition
It takes energy for the transport system to carry a molecule across the membrane and then return it to its original position.
Term
1
 Definition
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