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Exchange of Materials…read more

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Active Transport
Low concentration High
Uses Energy
The energy required
comes from cell
respiration, the more
respiration, the more
active transport
Cells involved in active
transport (root hair cells,
gut lining cells) have
mitochondria to increase
respiration…read more

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Active Transport Uses
Plants- uptake mineral ions
through the soil against the
concentration gradient (from
dilute soil to concentrated
plant cells)
Human Gut- Glucose moved
out of the gut and kidney into
the blood against the
concentration gradient
Marine animals- absorb too
much salt so the kidneys can'
t get rid of it all so they have
salt glands which use active
transport- otherwise they
would die.…read more

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Gaseous Exchange
We need oxygen to allow
Breathing in and out takes in
oxygen and removes waste CO2
Lungs adapted to make gas
exchange more efficient- made up
of alveoli which increase surface
area and are kept moist. Lungs
have a rich blood supply which
maintains the concentration
Oxygen is constantly being
removed from the blood. CO2 is
constantly entering the lungs so
gas exchange happens at the
highest concentration gradient to
increase efficiency.…read more

Slide 6

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Adapted to make gaseous
exchange most efficient in
the following ways:
Spherical shape= more
surface area
Moist surface makes
diffusion easy as gasses
can dissolve
Thin walls=easy diffusion
Good blood supply to
maintain concentration
gradient…read more

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