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CO2 - Carbon dioxide.
atmosphere
atmosphere
exhaled
It is brought back to the heart to be pumped through the lungs to be exhaled.
The pulmonary artery takes carbon dioxide (CO2) from the heart to the lungs. Oxygen is then carried back to the heart by the pulmonary vein. Finally, the aorta/arteries carry oxygen to the body.
As the blood passes though the pulmonary circulation, oxygen within the lungs binds with the hemoglobin and is carried from the lungs back to the heart and then from there on to the active tissues of the body.
from the lungs where does it go back
The pulmonary veins carry blood from the lungs back to the heart.
The inferior vena cava brings blood back to the heart from the lungs.
heart
The oxygen is carried in the blood from the left side of your heart. As if travels around your body it distributes that oxygen to other organs and collects carbo hydrate. When is reaches the right side of your heart, it guides the blood to the lungs which collects carbo hydrates. When the human breathes out that is released. The blood continues onto the left side of the heart where it collects oxygen and the cycle repeats, unless your death.