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biology 0610printed 41 · PDF 41
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There are 3 types of way through which the particles can spread out or move into
and out of the cell:
Diffusion
Osmosis
Active Transport
Diffusion
It is the net movement of particles from the area of high concentration to an area of
low concentration as a result of their random movement
Down the concentration gradient
Diffusion in living organisms
An important process in organisms body
Through this way organisms such as human get rid of their waste products and are
able to absorb or intake the substances that are necessary to them
No external energy is required to carry out the process of diffusion.
For diffusion it is not necessary to have a cell membrane; diffusion can happen with
and without the presence of cell membrane
Example of diffusion taking place in plants and animals
Site
Particle
From
To
Animal
Lungs
Oxygen
The alveoli in
the lungs
Blood
capillaries
Plant
Stomata(leaf)
Carbon
dioxide
The
atmosphere
Onto the leaf
Factors Influencing Diffusion
Temperature