HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Oesophagus and stomach, illustration. At top, food from the mouth has formed a bolus that has been swallowed and is passing down the oesophagus in a process called peristalsis. At centre, a bolus is about to enter the stomach, which secretes acid that breaks down the food. Digested food then passes out of the stomach through the pyloric valve (bottom left) into the later stages of the digestive system.
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