Which sequence correctly represents pulmonary circulation?

Which sequence correctly represents pulmonary circulation?

• A. Right atrium → pulmonary veins → lungs → pulmonary arteries → right ventricle.
• B. Left ventricle → aorta → lungs → pulmonary veins → right atrium.
• C. Right ventricle → pulmonary arteries → lungs → pulmonary veins → right atrium.
• D. Right ventricle → lungs → pulmonary arteries → pulmonary veins → right atrium.

Answer: (C)

Pulmonary circulation carries blood from the right heart to the lungs and back to the left heart. It begins in the right ventricle, which pumps deoxygenated blood into the pulmonary arteries that carry it to the lungs. In the lungs, gas exchange occurs and the blood becomes oxygenated. The oxygen-rich blood then returns to the heart through the pulmonary veins and drains into the left atrium. From there it moves to the left ventricle and onward to the systemic circulation. The correct sequence ends in the left atrium because that's where the oxygenated blood from the lungs enters the heart. The version described that ends in the right atrium would not reflect the actual return path of pulmonary circulation.

Pulmonary circulation carries blood from the right heart to the lungs and back to the left heart. It begins in the right ventricle, which pumps deoxygenated blood into the pulmonary arteries that carry it to the lungs. In the lungs, gas exchange occurs and the blood becomes oxygenated. The oxygen-rich blood then returns to the heart through the pulmonary veins and drains into the left atrium. From there it moves to the left ventricle and onward to the systemic circulation. The correct sequence ends in the left atrium because that's where the oxygenated blood from the lungs enters the heart. The version described that ends in the right atrium would not reflect the actual return path of pulmonary circulation.