SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY
Heart and lungs. Computer artwork of the heart and bronchial trees of the lungs seen from below. At upper right is the trachea (windpipe), which splits into two bronchi, one for each lung. Inside the lungs the bronchi further divide into many bronchioles. Each bronchiole becomes smaller, finally ending in alveoli (tiny air sacs, not seen). The lungs are the site of gaseous exchange; oxygen enters the blood and carbon dioxide is removed. The heart is a muscular organ that pumps blood to the lungs and around the body.
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