The given figure shows the cross sections of two blood vessels X and Y found in humans.
Identify them and select the incorrect option regarding them.

Options

A. X always carries oxygen rich blood away from the heart whereas y always carries carbon dioxide rich blood towards the heart.
B. Y is provided with valves to prevent the back flow of blood whereas valves are absent in X.
C. X is usually deep seated whereas Y is superficially placed.
D. Pressure of blood is much higher in X as compared to Y.

Answer

A

Explanation

In the given figures X shows the cross section of an artery and Y shows cross section of a vein. Arteries carry oxygen rich blood away from the heart, but pulmonary artery carries carbon dioxide rich blood away from the heart. On the other hand veins carry carbon dioxide rich blood towards the heart, but pulmonary vein carries oxygen rich blood towards the heart.