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The blood vessels are the tubes that carry the blood to and from the heart. They could be likened to the "Plumbing pipes" in a house. These blood vessels, through which the blood flows, are called arteries, veins, and capillaries.

The heart acts as a pump to push the blood through the blood vessels. Arteries carry oxygenated blood and nutrients from the heart to the body's tissues, while veins carry the "used" blood from the body tissues back to the heart.

The heart then pumps the used blood to go through the lungs again to pick up more oxygen. When the lungs fill the blood with oxygen again, the heart pumps the oxygenated blood through the arteries back out to the body organs and tissues. This circle of blood from the heart to the lungs and out to the body then back to the heart and lungs and so on, is called "circulation". The heart and blood vessels are called the circulatory system. The tiny blood vessels called capillaries, that reach into the tissue in smaller and smaller branches, are also a part of the circulatory system.

The circulatory system is called the cardiovascular system in medical terminology. "Cardio" means heart and "vascular" means blood vessels.

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