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The circulatory system supplies blood which contains oxygen, nutrients, and other substances to the different cells of the body. 2. An open circulatory system allows blood to be distributed to the different organs in a lower pressure. 3. In a closed circulatory system, blood passes through blood vessels and moves due to a difference in blood pressures.
At rest, the average person pumps five liters of blood from his heart each minute. The cardiovascular system is a closed network, which means five liters of blood must also be returned to the heart each minute for this rate of circulation to continue.