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Megan Nolan




Biology Revision Notes:
Diffusion and Active Transport

Diffusion:

Diffusion is the movement of particles or molecules (air/ water etc.) from a higher concentrated region
to a lower concentrated region. Diffusion will only happen until there is an equal concentration in both
regions- the substance is equally distributed. Only…

Page 2

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Megan Nolan




This is present in red blood cells- if a red blood cell is placed in a high water solution, it will lyse, and if
placed in a low water solution it will crenate.

Active transport:

Active transport is the movement of particles against the concentration gradient region, therefore,…

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