It doesn't. That job belongs to the lungs.
huh? but I've search it here in the answers
carbon dioxide
Veins
Pulmonary arteries
Arteries carry blood away from the heart and veins carry blood into the heart. Blood moving from the heart to the lungs through the pulmonary artery has less oxygen than blood moving from the lungs to the heart through the pulmonary vein, but most arteries carry oxygen-rich blood with little carbon dioxide, and most veins carry deoxygenated blood with carbon dioxide and other wastes.
No, they carry blood rich with oxygen away from the heart to all the body.
carbon dioxide
The heart pumps the blood that takes carbon dioxide to the lungs. So, the heart is a necessary element, but isn't the one effectively doing it.
The heart pumps blood low in oxygen and high in carbon dioxide to the lungs, where blood releases carbon dioxide and picks up oxygen.
Blood containing carbon dioxide flows from veins throughout the body to the heart, and then the heart pumps it to the lungs. Small air sacs (alveoli) in the lungs remove the carbon dioxide from the blood and release it into the lungs where it is exhaled.
Coronary veins carry deoxygenated blood with carbon dioxide away from the heart muscle and back to the right atrium of the heart.
Veins
Low level of carbon- dioxide and more level of oxygen.
Carbon dioxide is at high levels and oxygen at low levels in blood that is being pumped from the heart to the lungs.
In the right atrium & right ventricle
veins
The carbon dioxide diffuses into the plasma portion of the blood and is carried to the heart. From there it is carried to the lungs where it is released when you exhale.
the heart is a muscular organ which is as big as our fist. because both oxygen and carbon dioxide have to be transported by blood, the hear has different chambers to prevent the oxygen-rich blood from mixing with the blood containing carbon dioxide. the carbon dioxide rich blood has to reach the lungs for the carbon dioxide to be removed, and the oxygenated bolld from the lungs has to be brought back to the heart. this oxygen rich blood is then pumped to the rest of the body.