When it comes to the circulatory system, there are various names that can be used in place of blood-vessel. These can include arteries, veins, capillaries, and arterioles, among others. Arteries are the blood vessels that carry oxygenated blood from the heart to other parts of the body while veins transport deoxygenated blood back to the heart. Capillaries connect arteries and veins and are responsible for oxygen and nutrient exchange between the blood and body tissues. Arterioles, on the other hand, are small arteries that connect to capillaries. Whether you are discussing human anatomy, veterinary sciences, or medical professions, knowing the synonyms for blood-vessel is important.