Which vascular structure carries oxygenated blood away from the heart?

• A. Veins
• B. Capillaries
• C. Pulmonary Artery
• D. Arteries

Answer: (D)

Arteries are the vessels that carry blood away from the heart. In the systemic circulation, the blood leaving the heart through the arteries is oxygen-rich as it travels to tissues, making arteries the vessel type most closely associated with transporting oxygenated blood outward. Veins bring blood back to the heart, and capillaries are where gas exchange occurs. A helpful caveat is that the pulmonary artery also carries blood away from the heart, but it transports deoxygenated blood to the lungs. The general pattern the question relies on is the direction of flow and the typical oxygenation of arterial blood in the systemic circuit, which points to arteries as the best answer.