ART SIEGEL / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY ART SIEGEL / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Lung anatomy. Resin cast of the human lungs, showing the internal structure of windpipe and bronchial network. At upper centre (grey) is the trachea (windpipe) which introduces air from the larynx of the throat into the respiratory system. In the lungs two bronchi from the trachea divide into a network of smaller and finer bronchioles, seen here (pink, white). These bronchiole tubes end in tiny balloon-like air sacs called alveoli, where gas exchange occurs. Branching pulmonary blood vessels (yellow, brown) are associated with this lung network, in order that oxygen can enter the blood and carbon-dioxide can be breathed out.
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