GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Respiratory system. Computer artwork of a healthy respiratory system. Air is breathed in through the nose or mouth into the trachea (windpipe, centre). This splits into two bronchi, one for each lung. Inside the lungs the bronchi further divide into many bronchioles (dark red). 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 leaves.
Model release not required. Property release not required.