system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Retropulsion is the event seen in:
assistant
The correct answer is  Retropulsion is the event seen at the pylorus. As the pyloric wall contracts, some amount of food (chyme) moves into the duodenum whereas the remaining food rebounds from the pyloric sphincter. This is retropulsion. It will again move forward. This back and foh movement allows a thorough mixing of foodstuffs with the gastric juice, helping formation of chyme.