The
circulatory
system
consists
of
the
heart
,
the
____________________
____________________
,
and
the
blood
.
Its
function
is
to
carry
nutrients
and
____________________
to
the
cells
and
to
collect
____________________
____________________
from
the
body
.
The
heart
is
an
organ
made
of
____________________
that
contract
and
relax
.
This
action
____________________
the
blood
.
It
is
located
inside
the
____________________
between
the
____________________
.
It
has
four
parts
:
two
atria
and
two
____________________
.
