Heart, blood and blood vessels are the main components of transport system in human beings.
Functions of these components
Heart
Heart pumps oxygenated blood throughout the body. It receives deoxygenated blood from the various body parts and sends this impure blood to the lungs for oxygenation.
Blood
Blood transports oxygen, nutrients, CO2, and nitrogenous wastes.
Blood vessels
Blood vessels, arteries and veins carry blood to all parts of body
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