The Heart
blood circulation
to upper body
from
upper body
R
R
R
R
R
R
from
upper body
B
R
B
B
to lung
B
B
B
B
R
R
R
from lung
R
to lung
B
R
B
R
R
R
R
R
from lung
B
B
R
R
R
B
R= red
( blood carrying
oxygen
from the lungs)
B
B
B
B= blue
( blood without
oxygen)
R
from
lower body
R
to lower
body
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