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Diffusion
The
net movement
of particles from an area of higher concentration to an area of
lower
concentration
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Diffusion
1.
Molecules
move
about randomly
2.
Molecules spread
out
over time
3.
Molecules
become
evenly distributed
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Diffusion can happen in both
gases
and
liquids
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Partially permeable membrane
Only some molecules can
diffuse
through, like water,
glucose
, and amino acids. Larger molecules like proteins and starch cannot fit through.
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Diffusion is a
passive
process that does not require
energy
from the cell
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Factors affecting rate of diffusion
Concentration
gradient
Temperature
Surface
area
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Larger
concentration gradient
Higher
rate of diffusion
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Higher temperature
Higher
rate of
diffusion
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Larger
surface area
Higher
rate of diffusion
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