Matching Pairs The circulatory systemOnline version Parts of the circulatory system by África Pedrosa Salvador 1 Blood 2 Blood vessels 3 Veins 4 Heart 5 Capillaries 6 Arteries They carry blood from the rest of the body to the heart. They are very thin vessels that connect the arteries and veins. It is a red liquid that contains the nutrients and oxygen that our body needs. It also carries the unwanted waste substances that our body need to remove. They transport the blood around the body. They carry blood from the heart to the rest of the body. It pumps blood around the body.