The given diagram shows blood circulation pathway in the heart. Which of the following statements is correct regarding blood vessels W, X, Y and Z?

Options

A. W receives oxygenated blood from lungs.
B. Y supplies oxygenated blood to all the body parts.
C. X and Z carry deoxygenated blood and X takes it to the lungs.
D. None of these

Answer

D

Explanation

In the given diagram, W, X, Y and Z are vena cava, pulmonary artery, aorta and pulmonary vein respectively. Vena cava (W) brings deoxygenated blood from all parts of the body (except lungs) to the right atrium. The right atrium pumps this blood into the right ventricle, which then pumps it into the pulmonary artery (X). The pulmonary artery transfers the blood to the lungs for oxygenation. This oxygenated blood is then carried by pulmonary vein (Z) to left atrium which is then pumped into the left ventricle. The left ventricle pumps this blood into the aorta (Y), which carries this blood to all parts of the body.