The greatest difference in the concentration of respiratory gases is found in which of the following pairs of mammalian blood vessels?
A) the pulmonary vein and the superior vena cava
B) the veins from the right and left legs
C) the pulmonary artery and the inferior vena cava
D) the pulmonary vein and the aorta

Question

Quizplus · Accepted Answer

The greatest difference in the concentration of respiratory gases is found between the pulmonary vein and the superior vena cava. The pulmonary vein carries oxygenated blood from the lungs to the heart, while the superior vena cava carries deoxygenated blood from the upper part of the body to the heart, making their respiratory gas concentrations significantly different.

The Greatest Difference in the Concentration of Respiratory Gases Is