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biology p1 topic 1 - cell biology
diffusion
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Diffusion is the
spreading out
of particles resulting in a
net
movement
from an area of
high
concentration to an area of
low
concentration
Rates of diffusion can be increased by :
increasing
surface
area
increasing
concentration
gradient
increasing
temperature
decreasing
distance
particles
need to
travel
examples of diffusion
oxygen and
carbon dioxide
during
gas
exchange
urea
diffuses out and into the
blood
plasma
so it can be
excreted
in
kidneys