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4661954
Diffusion
Description
A-Level Biology (Membranes and Membrane Transport) Mind Map on Diffusion, created by Fauzia Ali on 26/02/2016.
No tags specified
biology
membranes and membrane transport
a-level
Mind Map by
Fauzia Ali
, updated more than 1 year ago
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Created by
Fauzia Ali
over 8 years ago
35
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Resource summary
Diffusion
The random movement of small particles from an area of high concentration to an area of low concentration
Pass between small gaps between phospholipid molecules or dissolves in lipid layer
Passive process, no ATP required
No membrane proteins needed
Examples
O2
CO2
Vitamin A,D,E
Factors affecting rate
Concentration Gradient
Higher the concentration gradient the more likely a molecule will collide with the membrane and cross it
Temperature
As temp increases molecules gain kinetic energy so moves faster, so collides with membrane more frequently
Size of molecule
The larger the molecule the harder it is to fit between phospholipids
Lipid solubility
The more lipid soluble a molecule is, the easier it is to dissolve and cross bilayer
Distance
The longer the diffusion path, the more distance the molecule needs to travel so the longer it takes
Surface Area
As S.A increases the more spaces for diffusion to happen
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