Ralph Hutchings

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Resin cast of the human lungs showing the bronchi and bronchioles (yellowish), airways (white), arteries (red), and veins (blue). Note the heart situated between the lungs. 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.