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 jugular vein
B. the veins from the right and left legs
C. the pulmonary vein and the aorta
D. the pulmonary artery and the inferior vena cava

Of the options given, the greatest difference in the concentration of respiratory gases is found between the pulmonary vein and the jugular vein (option A).

Explanation:

The jugular veins carry non-oxygenated blood from the head and its organs to the subclavian veins and from there to the superior vena cava. This blood has a high carbon dioxide content, and will pass into the right atrium.

The pulmonary veins carry freshly oxygenated blood from the lungs to the heart, so the oxygen content in these veins is high.  The pulmonary veins are the only veins that carry arterial blood.

This is why this pair of blood vessels in mammals has a large difference in gas concentration.

Learn more:

Arteries and veins link

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