Internet +100%
SPECIAL RATES FOR EDITORIAL AND BOOKS
RF RATES FOR OTHER USE
Coloured computed tomography (CT) scan of healthy lungs and heart. The lungs are the site of gaseous exchange, where carbon dioxide is removed from the blood and oxygen added. The heart (centre) is a hollow sac of muscular tissue that pumps oxygenated blood around the body and deoxygenated blood to the lungs.