The oxygen-filled blood goes back to the heart and the carbon dioxide in the alveoli is pushed out of the lungs and into the air we breathe out.
(The oxygen-filled blood; goes; back to the heart and the carbon dioxide in the alveoli) (The oxygen-filled blood; is pushed; out of the lungs and into the air) (the air; breathe out; we)
The oxygen-filled blood The oxygen-filled blood the air
goes is pushed breathe out
back to the heart and the carbon dioxide in the alveoli
out of the lungs and into the air
we