The
human
digestive
system
is
a
complex
series
of
organs
and
glands
that
processes
food
.
In
order
to
use
the
food
we
eat
,
our
body
has
to
____________________
the
food
down
into
____________________
molecules
that
it
can
process
;
it
also
has
to
excrete
waste
.
Most
of
the
digestive
organs
(
like
the
____________________
and
____________________
)
are
tube
-
like
and
contain
the
food
as
it
makes
its
way
through
the
body
.
The
digestive
system
is
essentially
a
long
,
twisting
tube
that
runs
from
the
mouth
to
the
anus
,
plus
a
few
other
organs
(
like
the
____________________
and
____________________
)
that
produce
or
store
digestive
chemicals
.
The
Digestive
Process
:
The
start
of
the
process
-
the
mouth
:
The
digestive
process
begins
in
the
mouth
.
Food
is
partly
broken
down
by
the
process
of
____________________
and
by
the
____________________
action
of
____________________
____________________
(
these
____________________
are
produced
by
the
salivary
glands
and
break
down
____________________
into
smaller
molecules
)
.
On
the
way
to
the
stomach
:
the
esophagus
-
After
being
chewed
and
swallowed
,
the
food
enters
the
____________________
.
The
____________________
is
a
long
tube
that
runs
from
the
mouth
to
the
stomach
.
It
uses
rhythmic
,
wave
-
like
muscle
movements
(
called
____________________
)
to
force
food
from
the
throat
into
the
stomach
.
This
muscle
movement
gives
us
the
ability
to
eat
or
drink
even
when
we're
____________________
-
____________________
.
In
the
stomach
-
The
stomach
is
a
large
,
sack
-
like
organ
that
____________________
the
food
and
bathes
it
in
a
very
strong
acid
(
____________________
acid
)
.
Food
in
the
stomach
that
is
partly
digested
and
mixed
with
stomach
acids
is
called
____________________
.
In
the
small
intestine
-
After
being
in
the
stomach
,
food
enters
the
____________________
,
the
first
part
of
the
small
intestine
.
It
then
enters
the
____________________
and
then
the
____________________
(
the
final
part
of
the
small
intestine
)
.
In
the
small
intestine
,
____________________
(
produced
in
the
liver
and
stored
in
the
gall
bladder
)
,
pancreatic
enzymes
,
and
other
digestive
enzymes
produced
by
the
inner
wall
of
the
small
intestine
help
in
the
____________________
of
food
.
In
the
large
intestine
-
After
passing
through
the
small
intestine
,
food
passes
into
the
large
intestine
.
In
the
large
intestine
,
some
of
the
water
and
____________________
(
chemicals
like
sodium
)
are
removed
from
the
food
.
Many
____________________
(
bacteria
like
Bacteroides
,
Lactobacillus
acidophilus
,
Escherichia
coli
,
and
Klebsiella
)
in
the
large
intestine
help
in
the
____________________
process
.
The
first
part
of
the
large
intestine
is
called
the
____________________
(
the
appendix
is
connected
to
the
____________________
)
.
Food
then
travels
upward
in
the
ascending
colon
.
The
food
travels
across
the
abdomen
in
the
transverse
colon
,
goes
back
down
the
other
side
of
the
body
in
the
descending
colon
,
and
then
through
the
sigmoid
colon
.
The
end
of
the
process
-
Solid
waste
is
then
stored
in
the
____________________
until
it
is
____________________
via
the
anus
.
