Question

Choose the schematic diagram which properly represents pulmonary circulation in humans:

• A. Right ventricle (oxygenated blood) $\to$ Lungs $\to$ deoxygenated blood $\to$ Aorta
• B. Right ventricle (deoxygenated blood) $\to$ Lungs $\to$ oxygenated blood $\to$ Left auricle
• C. Left ventricle (oxygenated blood) $\to$ Lungs $\to$ oxygenated blood $\to$ Right auricle
• D. Right ventricle (deoxygenated blood) $\to$ Lungs $\to$ oxygenated blood $\to$ Aorta

Answer 1

The correct option is B

Right ventricle (deoxygenated blood) $\to$ Lungs $\to$ oxygenated blood $\to$ Left auricle

During pulmonary circulation, deoxygenated blood from right ventricle flows through pulmonary artery and reaches lungs. After the gaseous exchange at lungs, CO₂ present in blood is exchanged with O₂ and brought back to left auricle of heart by the pulmonary veins.