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10 Cards in this Set
- Front
- Back
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Define diffusion |
Net movement of particles from an area of high concentration to an area of low concentration |
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At what point does diffusion stop |
When an equilibrium is reached |
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What is meant by 'diffusion is a passive process'? |
It does not require energy in the form of ATP |
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What type of molecules are easy to diffuse? |
Small Soluble in lipids |
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What type of molecules do carrier proteins help? |
Large molecules |
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Steps of the carrier protein: |
1) Large molecule attracts to carrier protein 2) Protein changes shape 3) Releases molecules on opposite side of membrane |
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Steps of the channel protein: |
Form pores in membrane for large particles to diffuse through |
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Simple diffusion depends upon: |
Concentration gradient Thickness of exchange surface Surface area |
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Facilitated diffusion depends upon: |
Concentration gradient The number of channel or carrier proteins |
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Recall Fick's Law of diffusion: |
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