In
animals
,
movement
is
coordinated
by
a
cluster
of
neurons
in
the
____________________
cord
called
the
central
____________________
generator
(
CPG
)
.
This
produces
signals
that
drive
muscles
to
____________________
rhythmically
in
a
____________________
that
produces
running
or
walking
,
depending
on
the
____________________
of
____________________
.
A
simple
signal
from
the
brain
instructs
the
CPG
to
____________________
between
different
____________________
,
such
as
going
from
a
standstill
to
walking
.
