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
Bulk mass contraction is seen in: March 2012
assistant
The correct answer is  Ans: D i.e. ColonMass movement/mass peristalsis occur twice a day.A ring of constriction appears near the splenic flexure and travels down sweeping the descending colon, pushing the faeces into the rectum