Question

Choose the schematic diagram, which properly represents pulmonary circulation in human.

• A. Right ventricle $\underset{blood}{\overset{Deoxygenated}{\to }}$ Lungs $\underset{blood}{\overset{Oxygenated}{\to }}$ Left auricle
• B. Right ventricle $\underset{blood}{\overset{Oxygenated}{\to }}$ Lungs $\underset{blood}{\overset{Deoxygenated}{\to }}$ Left auricle
• C. Left ventricle $\underset{blood}{\overset{Oxygenated}{\to }}$ Lungs $\underset{blood}{\overset{Deoxygenated}{\to }}$ Right ventricle
• D. Left auricle $\underset{blood}{\overset{Oxygenated}{\to }}$ Lungs $\underset{blood}{\overset{Deoxygenated}{\to }}$ Right ventricle

Answer 1

Answer: (A)

Right ventricle $\underset{blood}{\overset{Deoxygenated}{\to }}$ Lungs $\underset{blood}{\overset{Oxygenated}{\to }}$ Left auricle

• The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta.
• The deoxygenated blood pumped into the pulmonary artery is passed on to the lungs from where the oxygenated blood is carried by pulmonary veins into the left atrium. This pathway constitutes the pulmonary circulation.
• The oxygenated blood entering the aorta is carried by a network of arteries, arterioles, and capillaries to the tissues from where the deoxygenated blood is collected by a system of venules, veins, and vena cava and emptied into the right atrium. This is the systematic circulation. This is how double circulation takes place.

So, the correct answer is 'A'.