CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration showing the production of Adenosine triphosphate, or ATP, which transports chemical energy within cells for metabolism. Energy flashes indicate energy released when the phosphate bonds are broken. Highlights in the background cells show the movement of oxygen and glucose into the cell and to the mitochondria where ATP production takes place. At lower centre, carbon dioxide moves out of the cell.
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