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The circulatory system - Anatomy Next
If you took all the blood vessels out of an average adult and laid them out in one line, the line would stretch over 100,000 miles. The circulatory system keeps us alive, keeps us healthy. The heart is at the center of this system. It works as a pump that pushes blood through thousands of larger and smaller blood vessels. The oxygenated blood gets delivered through arteries to the tissue. The deoxygenated blood gets back to the heart through veins.