Which vessels carry blood through the body?

• A. Veins and arteries
• B. Lymph nodes
• C. Capillaries
• D. Nerves

Answer: (A)

Blood is moved through the body by a network of vessels, with the main transport highways being arteries and veins. Arteries carry blood away from the heart to tissues, while veins return it back toward the heart. Capillaries are the tiny connecting vessels between arteries and veins where gas and nutrient exchange occurs; they’re indeed blood vessels, but they mainly serve exchange and bridging between the larger vessels. Lymph nodes are part of the lymphatic system, not blood vessels, and nerves do not carry blood.