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biology
cell transport - paper 1
diffusion
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aaliyah mcneil
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Cards (7)
diffusion:
the net
movement
of
particles
from an area with a
high
concentration to an area with a
lower
concentration
in diffusion particles move
down
the
concentration
gradient
(from
high
to
low
concentration)
diffusion is a
passive
process meaning no
energy
is required
diffusion in humans:
nutrients in
small
intestine
diffuse in the
capillaries
through the
villi
oxygeon
diffuses from the air into
alveoli
into the
capiliary blood
carbon dioxide
diffuses from the
blood
in the
capillaries
into the
air
into in the
alveoli
urea
diffuses from
cells
into the
blood
for
excretion
in the
kidney
diffusion in plants:
carbon dioxide used for
photosynthesis
diffuses into the
leaves
through the
stomata
oxygen
produced during
photosynthesis
diffuses out of the
leaves
through the
stomata
diffusion
in fish:
oxygen
from
water
passing over the
gills
diffuses into the
blood
in the gill filaments
carbon dioxide diffuses from the
blood
in
the
gill filaments
into the
water
factors that affect the rate of diffusion:
difference in
concentration
- the
steeper
the concentration the
faster
the rate of
diffusion
temperature
- the
higher
the temperature the
faster
the rate of
diffusion
surface area
of the membrane - the
larger
the membrane the
faster
the rate of
diffusion