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The diagram shows the route blood takes to distribute nutrition around the body, with the following labels (from the top, clockwise): head and forelimbs, pulmonary artery, lung, pulmonary vein, aorta, kidneys, trunk and legs, O2, CO2, vein, liver, hepatic vein, heart, lung, O2, CO2, anterior vena cava.

 3.3 Taking the nutrients around the body