HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Lungs anatomy, computer artwork. At top left is the trachea (windpipe, white), which splits into two bronchi, one for each lung (blue). Inside the lungs the bronchi further divide into many bronchioles (small, white). Each bronchiole becomes smaller, finally ending in alveoli (tiny air sacs, bulbous, right), which are the site of gaseous exchange, where oxygen enters the blood and carbon dioxide is removed. Oxygen dissolves in the moist surface of the alveoli and passes into capillaries (red blood vessels) that carry it into the bloodstream. Carbon dioxide passes out of venules (blue blood vessels) into the alveoli and is exhaled through the lungs.
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