Summary
Summary Unit 2 - Cells Cell Membrane
- Module
- Unit 2 - Cells
- Institution
- AQA
Unit 2 - Cells Cell Membrane
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Cell Membrane - SummaryDiffusion Diffusion is the movement of particles from an area of high concentration to
low concentration.
It is a passive process which allows small, lipid soluble and non charged
molecules to move across the membrane.
Concentration gradient
Surface area
Thickness of diffusion area
Temperature
Size of particle
Facilitated Facilitated diffusion requires the usage of carrier and channel proteins.
Diffusion Carrier proteins transport large molecules.
The large molecule attaches to the carrier molecule and the protein
changes its shape allowing the large molecules to pass through to the
other side of the carrier protein.
Channel proteins transport charged particles.
They act as pores which allow charged molecules to pass through.
Size of carrier proteins
Number of carrier proteins
Diameter of carrier proteins
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