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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.
2. Respiratory System and Circulatory System. The circulatory system works well with the respiratory system to make sure that oxygen-rich blood can flow through your body. That is, your respiratory system supports your circulatory system with air or more specially oxygen which is sent to relative organs via arteries.