Which blood vessel has the highest concentration of carbon dioxide?
Both the superior vena cava and the inferior vena cava are blood vessels that have the highest concentration of carbon dioxide in the human body. They bring deoxygenated blood to the heart after the blood has traveled around the body — the superior vena cava carrying blood from the upper part of the body and the inferior vena, from the lower part.References:Google Books; Joseph E. Parrillo, R.