CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Lungs. Coloured historical artwork based on a dissection of the chest showing the lungs (grey/brown) and various blood vessels. The aorta (red) is the body's main artery, and here is seen splitting into branches (carotid arteries) which run up into the head. Also seen is the vena cava (blue), the main vein leading into the heart, which is seen dividing into the two subclavian veins. The lungs are the organs responsible for oxygenating the blood. Inside, the airways divide into smaller and smaller branches, eventually ter- minating in alveoli (air sacs) through which oxy- gen enters the blood & carbon dioxide leaves it.
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