Answer:
arteries, veins, and capillaries
Step-by-step explanation:
Arteries carry oxygenated blood away from the heart.
ii)Arteries also contain a strong, muscular middle layer that helps pump blood through the body.
Capillaries connect the arteries to veins. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs
Veins carry the blood back to the heart. They’re similar to arteries but not as strong or as thick. Unlike arteries, veins contain valves that ensure blood flows in only one direction