ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Lung airways. Computer graphic of the trachea and bronchiole airway network in the human lungs. At upper centre, the wide trachea (windpipe) introduces air from the larynx of the throat into the respiratory system. It branches into 2 bronchi which enter the pair of lungs (not seen). Within the lungs the bronchi divide into an internal network of smaller and finer bronchioles. These bronchiole tubules finally end in tiny air sacs called alveoli. In alveoli, exchange of gases occurs: inhaled oxygen enters the blood and carbon-dioxide is breathed out. For this respiration process, the lungs are inflated and deflated by movement of the diaphragm and ribs.
Model release not required. Property release not required.