After passing by all body cells to deliver nutrients and oxygen, the blood is oxygen-poor (deoxygenated) and has picked up waste products such as Carbon dioxide., Deoxygenated blood travels back to the (right side of the) heart via the vena cava., Deoxygenated blood is pumped (by the heart) through the pulmonary artery towards the lungs., In the lungs, oxygen enters the blood (becoming oxygen-rich or oxygenated) and releases carbon dioxide., Oxygenated/oxygen-rich blood travels to the (left side of the) heart via the pulmonary vein., Oxygenated blood is forced out of the heart through the aorta., Blood travels throughout the body to deliver oxygen (and nutrients) to the cells..

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