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The human circulatory system is a vital network responsible for transporting blood, nutrients, oxygen, and hormones throughout the body. It of the heart, which acts as a pump, a vast system of blood vessels: arteries, , and . Arteries carry oxygen- blood away the heart, veins oxygen- blood back it. In addition to delivering essential substances, this system also removes waste products like carbon dioxide from the cells. Its proper functioning is absolutely essential for sustaining life and maintaining overall health.