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Khan Academy
Khan Academy: Biology: The Lungs and Pulmonary System
A detailed account of human ventilation through the pulmonary system. [20:33]
Bozeman Science
Bozeman Science: Respiratory System
Paul Andersen starts this video with a description of the respiratory surface. He explains how worms, insects, fish, and mammals take in oxygen and release carbon dioxide. He then tours the major organs of the respiratory system; from...