PR. M. BRAUNER / SCIENCE PHOTO LIBRARY PR. M. BRAUNER / SCIENCE PHOTO LIBRARY
Lung. Coloured bronchography (X-ray) of a lateral (side) view of a healthy human lung. The front of the body is at right. A contrast medium has been added to show the network of airways (orange). The trachea (wind pipe) enters the lungs and splits into the two bronchi (not seen). The bronchi then further divide into bronchioles, which continue to divide and decrease in diameter. The bronchioles eventually end in groups of tiny air sacs known as alveoli (not seen). Alveoli are the site of gaseous exchange between the lungs and blood; oxygen enters the blood and carbon dioxide leaves.
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