Why is the human heart called the double loop?

Why is the human heart called the double loop?
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There are two loops to the human heart, a pulmonary loop and asystemic loop. All of the oxygen-poor blood returns to the heartvia the right atrium and flows into the right ventricle. When theright ventricle contracts blood is forced into the pulmonaryarteries to the lungs to receive fresh oxygenation before returningto the heart. That is called the pulmonary loop, pulmonaryreferring to the lungs. When the freshly oxygenated blood returnsto the heart it will flow into the left atrium and then the leftventricle. The left ventricle will squeeze blood into the aortawhich delivers the oxygenated blood to the rest of the body. Thatis known as the systemic loop, as in the body systems. When thedeoxygenated blood drains from the body tissues back through thevenous system, it will empty into the right atrium of the heartbeginning the process all over again.
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