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

if oesophagus follows peristaltic movement and does not allow food to

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