The document discusses the circulatory system and describes its three main components: arteries, which carry oxygenated blood away from the heart; veins, which carry deoxygenated blood back to the heart; and capillaries, which connect arteries and veins and allow for the exchange of water, nutrients and waste. It notes that the heart pumps blood through over 60,000 miles of blood vessels in the human body, circulating an average of over 1,000 gallons per day.

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