ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Lung cancer. Computer artwork showing cancer (green, centre) growing amongst the alveoli (pink spheres) in a lung. Lung cancer is a common type of cancer, and is almost exclusively caused by tobacco smoking. The alveoli are tiny air sacs in the lungs through which the exchange of gases with the blood takes place. They are linked by a branched network of tiny airways called bronchioles.
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