Which organ is NOT considered part of the cardiovascular system?

• A. Lungs
• B. Heart
• C. Blood Vessels
• D. Aorta

Answer: (A)

This question tests which organs belong to the cardiovascular system. The cardiovascular system centers on the heart as the pump, the blood vessels that form its network, and the blood that circulates through them. The lungs, while essential for life, are part of the respiratory system and specialize in gas exchange. They do interact with the cardiovascular system—blood is sent to the lungs to be oxygenated and then returns to the heart—but this does not make the lungs cardiovascular organs. The heart, the blood vessels, and the aorta are the core components of the cardiovascular system, handling pumping and distribution of blood. So the lungs are not considered part of the cardiovascular system.