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There are two loops to the human heart, a pulmonary loop and a systemic loop. All of the oxygen-poor blood returns to the heart via the right atrium and flows into the right ventricle. When the right ventricle contracts blood is forced into the pulmonary arteries to the lungs to receive fresh oxygenation before returning to the heart. That is called the pulmonary loop, pulmonary referring to the lungs. When the freshly oxygenated blood returns to the heart it will flow into the left atrium and then the left ventricle. The left ventricle will squeeze blood into the aorta which delivers the oxygenated blood to the rest of the body. That is known as the systemic loop, as in the body systems. When the deoxygenated blood drains from the body tissues back through the venous system, it will empty into the right atrium of the heart beginning the process all over again.

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Jeffry Ortiz

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3y ago

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