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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 circulates blood in two circuits: the pulmonary circuit and systemic circuit. Circulatory System Function The circulatory system provides several necessary functions in the body.