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The cardiovascular system contains the heart located in the thoracic cavity between the lungs. The heart is surrounded by membranes and fluid-filled spaces that help reduce friction during contractions. It has four chambers - two upper atria and two lower ventricles separated by septa - that work together to pump blood through two circuits: pulmonary and systemic circulation. Blood vessels bring deoxygenated blood to the right atrium and oxygenated blood to the left atrium from the lungs. Valves between the

Author

formalreport1996

Language

EN