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Booklet 2
Respiratory systems and gas exchang
gas exchange in animals
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Biology > Booklet 2 > Respiratory systems and gas exchang > gas exchange in animals
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Cards (9)
simple organisms do not require
specialised gas exchange system

Because they can
exchange gases across the body surface
Skin
earthworms use their
skin
as a
gas
exchange
surface
they have
blood
vessels
very
close
to the
surface
of
the
skin
they ensure that their skin is
moist
to aid the diffusion of gases
tracheal system
insects use this system, as they have an
exoskeleton
that prevents them from being able to use their skin as a
gas
exchange surface
they have opening in their
exoskeleton
called
spiracles
How
spiracles
work
oxygen
enters the organism through the mouth or the spiracles and travels through the tracheoles to the cells.
carbon
dioxide
is also removed through the
spiracles
via
diffusion
this is often aided by
rhymical
movements
of the abdomen or thorax
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