The term 'blood carrier' refers to the vessels that transport blood throughout the body. An ARTERY is a type of blood VESSEL that carries oxygenated blood away from the heart. The AORTA is the largest ARTERY in the body and is responsible for carrying oxygenated blood from the heart to the rest of the body. Veins are blood vessels that carry deoxygenated blood back to the heart. Lastly, a VESSEL is a general term for any type of tube-like structure that transports fluids, such as blood.