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When food enters the oesophagus, waves of muscular contraction and relaxation push the bolus down towards the stomach. As the muscle contracts and squeezes, the bolus moves to the area where the muscle is relaxed, which will be further down the oesophagus. The muscles further up will stay cntracted so that the bolus can't work it's way back up. Eventually, the bolus will reach the stomach.

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12y ago

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