Ralph Hutchings

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Resin cast of a human lung section showing the airways (white), arteries and capillaries (red), and veins (blue). The lungs take in around 0.5 liters of air in every breath, with around 12 breaths per minute at rest. The lungs have a large network of airways, which gives them a huge surface area for oxygen to diffuse into the blood and carbon dioxide to diffuse out.