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Human circulatory system

The circulatory system (also called the cardiovascular system) is the body system that moves blood around the body. It consists of the heart and blood vessels. The blood carries various materials that the body needs, and takes away waste and harmful substances.

Blood vessels that take blood away from the heart are arteries. Arteries divide into smaller arteries as they go away from the heart. The smaller arteries that connect to the capillaries, are called arterioles.