How the Body Works: The Circulatory System A number of animated pages show the blood flowing through the veins and arteries as the heart pumps and the valves open and close.
(the Body Works; show; the blood flowing through the veins and arteries) (the blood; flowing; through the veins and arteries) (the heart; pumps; )
the Body Works the blood the heart
show flowing pumps
the blood flowing through the veins and arteries
through the veins and arteries