Question

Choose the pathway which properly represents pulmonary circulation in humans:

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

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 atrium of heart by the pulmonary veins.