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The human circulatory system is a double circulatory system as it has two separate circuits, and blood passes through the heart twice. Blood is pumped away from the heart in arteries and returns to the heart at low pressure in veins.
One of the most vital life-sustaining organs is the four-chambered muscular organ, the human heart. It's the same size as a clenched fist, one of the strongest muscles in the human body, and weighs around 200 to 425 grams.