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Biology
Topic 4
Diffusion
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Created by
Jayden Clauer
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Diffusion is the
net movement
of molecules or ions from a region of
high
concentration to
low
concentration until an
equilibrium
is reached
Diffusion is a
passive
process so doesn't require
extra input
of energy
Increase rate of diffusion by
increasing
temperature
higher
concentration gradient
higher
surface area
shorter
diffusion pathway
Rate of diffusion is calculated by
surface area
x
concentration gradient
all divided by
diffusion distance
Other factors that affect rate of diffusion
molecular mass
/size
charge
/polarity
Water-filled channel proteins can be described as
aquaporins
Facilitated
diffusion is the movement of
molecules
across a membrane with the help of a
protein
Channel
proteins increase the
permeability
of the
plasma
membrane to
water
and other molecules
Carrier
proteins changes
shape
and
rotates
through the membrane and deposits the molecule on the other side