Breathing
is
the
process
that
brings
oxygen
in
the
air
into
your
lungs
and
moves
oxygen
and
through
your
body
.
Our
lungs
remove
the
oxygen
and
pass
it
through
our
bloodstream
,
where
it's
carried
off
to
the
tissues
and
organs
that
allow
us
to
walk
,
talk
,
and
move
.
Our
lungs
also
take
carbon
dioxide
from
our
blood
and
release
it
into
the
air
when
we
breathe
out
.
The
are
hollow
spaces
in
the
bones
of
your
head
.
Small
openings
connect
them
to
the
nasal
cavity
.
The
sinuses
help
to
regulate
the
temperature
and
humidity
of
the
air
your
breathe
in
,
as
well
as
to
lighten
the
bone
structure
of
the
head
and
to
give
tone
to
your
voice
.
The
NASAL
(
nose
)
is
the
best
entrance
for
outside
air
into
your
respiratory
system
.
The
hairs
that
line
the
inside
wall
are
part
of
the
air
-
cleansing
system
.
Air
can
also
enters
through
your
CAVITY
(
mouth
)
,
especially
if
you
have
a
mouth
-
breathing
habit
or
your
nasal
passages
may
be
temporarily
blocked
.
The
are
overgrown
lymph
tissues
at
the
top
of
the
throat
.
When
your
adenoids
interfere
with
your
breathing
,
they
are
sometimes
removed
.
The
lymph
system
,
consisting
of
nodes
(
knots
of
cells
)
and
connecting
vessels
,
carries
fluid
throughout
the
body
.
This
system
helps
your
body
resist
infection
by
filtering
out
foreign
matter
,
including
germs
,
and
producing
cells
(
lymphocytes
)
to
fight
them
.
The
are
lymph
nodes
in
the
wall
of
your
pharynx
.
Tonsils
are
not
an
important
part
of
the
germ
-
fighting
system
of
the
body
.
If
they
become
infected
,
they
are
sometimes
removed
.
The
(
throat
)
collects
incoming
air
from
your
nose
and
passes
it
downward
to
your
trachea
(
windpipe
)
.
The
is
a
flap
of
tissue
that
guards
the
entrance
to
your
trachea
.
It
closes
when
anything
is
swallowed
that
should
go
into
the
esophagus
and
stomach
.
The
(
voice
box
)
contains
your
vocal
cords
.
When
moving
air
is
breathed
in
and
out
,
it
creates
voice
sounds
.
The
is
the
passage
leading
from
your
mouth
and
throat
to
your
stomach
.
The
(
windpipe
)
is
the
passage
leading
from
your
pharynx
to
the
lungs
.
The
RIBS
are
bones
supporting
and
protecting
your
chest
cavity
.
They
move
a
small
amount
and
help
the
lungs
to
expand
and
contract
.
The
trachea
divides
into
the
two
main
(
tubes
)
,
one
for
each
lung
.
The
bronchi
,
in
turn
,
subdivide
further
into
bronchioles
.
The
RIGHT
is
divided
into
three
,
or
sections
.
The
left
lung
is
divided
into
two
.
The
are
the
two
membranes
that
surround
each
lobe
of
your
lungs
and
separate
the
lungs
from
your
chest
wall
.
The
bronchial
tubes
are
lined
with
(
like
very
small
hairs
)
that
have
a
wave
-
like
motion
.
This
motion
carries
(
sticky
phlegm
or
liquid
)
upward
and
out
into
the
throat
,
where
it
is
either
coughed
up
or
swallowed
.
The
mucus
catches
and
holds
much
of
the
dust
,
germs
,
and
other
unwanted
matter
that
has
invaded
your
lungs
.
Your
lungs
get
rid
of
the
mucus
through
coughing
.
The
is
the
strong
wall
of
muscle
that
separates
your
chest
cavity
from
your
abdominal
cavity
.
By
moving
downward
,
it
creates
suction
to
draw
in
air
and
expand
the
lungs
.
The
smallest
section
of
the
bronchi
are
called
,
at
the
end
of
which
are
the
alveoli
(
plural
of
alveolus
)
.
The
are
the
very
small
air
sacs
that
are
the
destination
of
air
that
you
breathe
in
.
The
are
blood
vessels
that
are
imbedded
in
the
walls
of
the
alveoli
.
Blood
passes
through
the
capillaries
,
brought
to
them
by
the
PULMONARY
and
taken
away
by
the
PULMONARY
.
While
in
the
capillaries
,
the
blood
moves
carbon
dioxide
into
the
alveoli
and
takes
up
oxygen
from
the
air
in
the
alveoli
.