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Diffusion
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Diffusion
The
gradual
movement of particles from places where there are more of them to places where there are
fewer
of them
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Diffusion
happens in both solutions and gases
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The
bigger
the
concentration
gradient (the difference in concentration)
The
faster
the
diffusion
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A
higher
temperature
Gives a
faster
diffusion rate because the particles have more energy and move around
faster
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Cell
membranes
They hold the cell
together
They let stuff
in
and
out
as well
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Only very
small
molecules can diffuse through
cell membranes
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Small molecules that can diffuse through cell membranes
Oxygen
(needed for respiration)
Glucose
Amino
acids
Water
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Big molecules like
starch
and proteins can't fit through the
cell membrane
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Particles flow through the cell membrane
From where there's a
higher
concentration to where there's a
lower
concentration
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The
larger
the surface area of the membrane
The
faster
the
diffusion rate
, because more particles can pass through at once
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