ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Human lungs. Computer artwork of a pair of human lungs, one of which has been cut away to show the internal structure of the lung. The lungs are the site of gaseous exchange between the air and the blood. Air is inhaled through the trachea or windpipe (blue, upper centre). At the top of the trachea is the larynx (voicebox, red). The trachea divides into two bronchi, one for each lung. Inside the lung, the bronchi split into smaller airways called bronchioles, which terminate in alveoli (purple, lower right). In these airsacs, oxygen diffuses into the blood and carbon dioxide diffuses out to be exhaled.
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