GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Heart and lungs, chest X-ray composite. The heart X-ray (centre) has been aligned with a chest X-ray to show where the heart is located within the human rib cage. The airways of the lungs (faint white branching structures) are also visible. The heart-lung system both reoxygenates blood (in the lungs) and pumps it around the body (by the muscular contraction of the heart).
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