diffusion biology 2 aqa
- Created by: Kate Rontree
- Created on: 27-05-16 09:43
View mindmap
- Diffusion
- gradual movement of particles from a high to low concentration.
- (spread out)
- happens in both solutions and gases
- the particles are free to move about randomly.
- The bigger the difference in concentration the faster the diffusion rate.
- cell membranes
- they hold the cell together but let stuff in and out as well.
- dissolved substances can move in and out of cells by diffusion.
- only very small molecules can diffuse through cell membranes - like oxygen, glucose, amino acids and water.
- big molecules like starch and protein cant fit through the membrane.
- if there are a lot more particles on one side of the membrane, there is a net movement from that side.
- the particles are free to move about randomly.
- gradual movement of particles from a high to low concentration.
Comments
No comments have yet been made