if oesophagus follows peristaltic movement and does not allow food to travel in upward direction
then,what about vomiting

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Solution

It usually occurs as a precursor to vomiting. Local irritation of the stomach, such as bacteria or food poisoning, activates the emetic center of the brain which in turn signals an imminent vomiting reflex. Food then moves in the opposite direction, often from the duodenum into the stomach

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When we ingest our food it goes the oesophagus in the form of bolus . But due to some uneasiness if we force out the food by vomiting (by ourselves not automatically) the food comes out as we ate it .. how is it possible that after the for changes into bolus how can it come out as we ate it???

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if oesophagus follows peristaltic movement and does not allow food to travel in upward direction then,what about vomiting

It usually occurs as a precursor to vomiting. Local irritation of the stomach, such as bacteria or food poisoning, activates the emetic center of the brain which in turn signals an imminent vomiting reflex. Food then moves in the opposite direction, often from the duodenum into the stomach

if oesophagus follows peristaltic movement and does not allow food to travel in upward direction
then,what about vomiting