SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Heart pacemaker. X-ray of the chest of a patient who has been fitted with a pacemaker (upper right). The heart is the white mass at lower right. The black spaces are the lung cavities, surrounded by chest bones (also white). A wire is seen running from the pacemaker to the heart. The pacemaker supplies electrical impulses along this wire to keep the heart beating regularly in cases of an irregular heartbeat.
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