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The heart is the central organ of the circulatory system, and pumps blood into the blood vessels which carry it to all the body parts. All these events occur with each heartbeat. The average heart rate in a normal person is 72 beats per minute, so one can imagine the speed at which blood flows through the body.
The Circulatory System moves nutrients to the cells of the body to feed them and help them fight disease. The main parts of the Circulatory System are the heart, blood and blood vessels. KidsHealth: Your Heart and Circulatory System.