ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Heart-lung machine being prepared for cardiac surgery. This machine takes over the function of the heart and lungs while the heart is temporarily stopped during surgery, allowing more time to operate. The machine oxygenates the blood and removes carbon dioxide. It also heats the blood to the correct temperature before pumping it back into the patient's body.
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