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A lung was an organ used for respiration.
Instead of large lungs, Gallifreyans had a series of pulmonary tubes parallel to the lymphatic system. This made them buoyant, allowing them to swim with ease. (PROSE: Island of Death) They could also survive longer without much oxygen, past the point where a human would be unconscious; (TV: The Ark in Space, The Two Doctors, Smith and Jones, Mummy on the Orient Express, PROSE: Legacy)