The
circulatory
system
is
composed
of
the
____________________
,
which
pumps
blood
throughout
the
body
,
and
blood
vessels
which
are
arteries
,
veins
and
____________________
.
Deoxygenated
blood
enters
the
____________________
atrium
through
the
____________________
and
superior
vena
cava
.
The
blood
flows
to
the
right
____________________
which
then
pumps
the
blood
through
the
____________________
artery
.
The
blood
enters
the
____________________
surrounding
the
____________________
where
____________________
diffuses
in
the
the
bloodstream
and
into
red
blood
cells
.
The
blood
leaves
the
lungs
through
the
pulmonary
____________________
and
into
the
____________________
atrium
and
finally
into
the
left
ventricle
.
This
end
of
the
pulmonary
____________________
and
the
the
beginning
of
the
____________________
circuit
.
The
____________________
is
the
largest
artery
in
the
body
and
brings
the
blood
through
____________________
that
become
smaller
____________________
and
capillaries
.
Oxygen
diffuses
out
of
the
bloodstream
and
into
surrounding
____________________
.
____________________
____________________
enters
the
blood
and
is
converted
in
carbonic
acid
.
Capillaries
become
larger
____________________
,
then
veins
.
These
join
together
to
form
the
____________________
____________________
and
enter
the
right
atrium
.
