The
first
part
of
____________________
occurs
in
the
____________________
.
The
teeth
____________________
,
chew
and
____________________
the
food
into
____________________
____________________
.
At
the
same
time
the
____________________
glands
____________________
a
____________________
known
as
____________________
.
After
____________________
has
been
chewed
and
mixed
with
____________________
in
the
____________________
,
it
enters
the
____________________
known
as
____________________
.
It
links
the
throat
with
the
____________________
.
The
oesophagus
is
surrounded
by
a
ring
of
____________________
that
can
____________________
and
____________________
at
different
times
to
____________________
the
____________________
slowly
towards
the
____________________
.
This
is
known
as
____________________
.
