CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Computer digitised illustration of a human lung, trachea and bronchiole network. At top, the wind- pipe or trachea introduces air from the larynx of the throat into the respiratory system. It branches into two bronchi which enter the pair of lungs. Here, one lung (at right, orange) is intact while the internal network of bronchioles in the other lung is seen. These bronchiole tubes end in tiny balloon-like sacs called alveoli; exchange of gases occurs in the alveoli: oxygen enters the blood & carbon-dioxide is breathed out. For this respiration process, the lungs are inflated and contracted by movement of the diaphragm and ribs.
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