National Geographic Daily News

Lungs Cast

Photograph by Martin Dohrn/Royal College of Surgeons/Science Photo Library

Bronchi fan out like coral in this resin cast that also shows pulmonary arteries and trachea. The bronchi supply air and pulmonary arteries supply blood to the lungs. Together they take in air from the atmosphere, oxygenate the blood, and excrete the carbon dioxide back out of the body.

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