avtavr: The respiratory system within the lungs — illustrated here by a model made from a resin cast — consists of a closely interlinked system of air passages, arteries and veins. Deoxygenated blood, shown in blue, is pumped from the heart through

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avtavr: The respiratory system within the lungs — illustrated here by a model made from a resin cast — consists of a closely interlinked system of air passages, arteries and veins. Deoxygenated blood, shown in blue, is pumped from the heart through

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