Fauzia Ali
Mind Map by Fauzia Ali, updated more than 1 year ago
Fauzia Ali
Created by Fauzia Ali about 4 years ago


A-Level Biology (Membranes and Membrane Transport) Mind Map on Diffusion, created by Fauzia Ali on 02/26/2016.

Resource summary

1 The random movement of small particles from an area of high concentration to an area of low concentration
1.1 Pass between small gaps between phospholipid molecules or dissolves in lipid layer
1.1.1 Passive process, no ATP required
2 No membrane proteins needed
3 Examples
3.1 O2
3.2 CO2
3.3 Vitamin A,D,E
4 Factors affecting rate
4.1 Concentration Gradient
4.1.1 Higher the concentration gradient the more likely a molecule will collide with the membrane and cross it
4.2 Temperature
4.2.1 As temp increases molecules gain kinetic energy so moves faster, so collides with membrane more frequently
4.3 Size of molecule
4.3.1 The larger the molecule the harder it is to fit between phospholipids
4.4 Lipid solubility
4.4.1 The more lipid soluble a molecule is, the easier it is to dissolve and cross bilayer
4.5 Distance
4.5.1 The longer the diffusion path, the more distance the molecule needs to travel so the longer it takes
4.6 Surface Area
4.6.1 As S.A increases the more spaces for diffusion to happen
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