ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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Inferior view of the lungs and heart. When air is inhaled into the lungs, it flows through large tubes called bronchi, then branches into smaller tubes known as bronchioles, and ends up in the alveoli, small pouches in the respiratory system where oxygen is transferred from the air to the bloodstream.
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