188
The
Respiratory
System
is
made
up
of
the
trachea
(wind
pipe),
bronchi,
bronchioles
and
alveoli
(air
sacs).
It
has
a
good
supply
of
blood,
which
arrives
de-oxygenated.
It
then
collects
oxygen
from
the
alveoli
and
becomes
oxygenated.
The
diaphragm
is
a
layer
of
muscle
beneath
the
lungs.
As
it
contracts
and
flattens
the
ribs
also
rise
up
and
out.
The
chest
cavity
increases
in
volume,
and
air
is
sucked
in
(inhaled).
As
the
diaphragm
relaxes,
the
ribs
also
go
in
and
down.
The
chest
cavity
is
squashed,
and
air
is
forced
out
-
exhaled.
When
inhaling
air,
the
air
is
filtered
by
the
hairs
in
the
nose.
It
then
passes
down
the
trachea,
where
mucus,
which
is
produced
by
goblet
cells,
trap
any
bacteria
or
dust.
Tiny
hairs
called
cilia
then
waft
the
mucus
up
to
the
throat,
where
it
can
drop
down
to
the
stomach
and
be
destroyed
by
acid.
Once
in
the
air
sacs
(alveoli),
the
oxygen
diffuses
into
the
blood
capillaries,
and
the
carbon
dioxide
and
water
vapour
difuse
from
the
blood
into
the
alveoli.
This
air
is
then
breathed
out
when
we
next
exhale.
Drag the Tiles into position to put the segments of text into the correct order.
Unscramble the text by putting the words below into the correct order in the box above.

24
"trachea",9
"alveoli",15
"de-oxygenated.",27
"oxygenated.",37
"diaphragm",39
"contracts",50
"up",57
"out.",59
"increases",63
"(inhaled).",71
"relaxes,",75
"down.",82
"squashed,",87
"exhaled.",94
"filtered",101
"hairs",104
"mucus,",115
"cilia",130
"mucus",134
"stomach",146
"(alveoli),",157
"diffuses",160
"blood",175
"exhale.",188
Fill in the gaps by typing in the missing word, or by dragging the correct word from the list below.
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