Dissolved substances move in and out of cells by diffusion, osmosis and active transport.
Diffusion is the net movement or particles from an area where they are at a high concentration to an area where they are at a lower concentration.
The overall or net movement = particles moving in - particles moving out
The bigger the difference in concentration, the faster the rate of diffusion.
When a substance is moving from a higher concentrated area to one which is just a bit lower, the movement toward the less concentrated area will appear to be quite slow.
Concentration gradient: The difference between two areas of concentration.
Increase in temperature means the particles move more quickly. This then means diffusion will take place more quickly as movement of the particles speeds up.
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