Which type of blood vessel carries blood away from the heart?

• A. Veins
• B. Capillaries
• C. Venules
• D. Arteries

Answer: (D)

Arteries carry blood away from the heart. When the heart pumps, it ejects blood into the arterial system under high pressure, and arteries are built with thick, elastic walls and a muscular layer to withstand and regulate that pressure. This structural design supports the rapid, directed flow of blood to tissues throughout the body, delivering oxygen and nutrients in the systemic circulation. Veins, by contrast, return blood to the heart and have thinner walls with valves to prevent backflow, while capillaries are tiny vessels where exchange between blood and cells occurs. An important note is that there is a Pulmonary circuit exception: the pulmonary artery carries blood away from the heart to the lungs, with the pulmonary veins returning it to the heart.