Choose the schematic diagram which properly represents pulmonary circulation in humans:
Right ventricle (deoxygenated blood) → Lungs → oxygenated blood → 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.