Human circulatory system
The heart ,blood and blood vessels form the circulatory system. Blood vessels are tube -like and are connected to the heart.The circulatory system controls the flow of blood in the body. The heart works like a pump. The movement of the blood vessels by the pumping action of the heart is called circulation.
The heart makes the sound, lub-dub,lub -dub, as it pumps blood to every part of the body. Blood vessels are of two types -arteries and veins. Arteries carry blood from the heart to every part of the body.
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