This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Factor increasing gastric emptying 
Select and explain. 
A. Presence of fatty food in stomach, B. Distension of stomach, C. Presence of tryptophan in stomach, D. Presence of acid in stomach
B: Distension of stomach
Answer: B: Distension of stomach 
Explanation: Factors affecting increasing Gastric emptying (predominantly neural pathway is involved) Increased food volume in the stomach- gastric distension - stretch receptor activation -promotes increased emptying from the stomach. Type of food: order of gastric emptying is carbohydrate > protein > fat Gastrin has mild to moderate effect on gastrin emptying. Gastric distension and product of protein digestion stimulates gastrin release while acid in stomach inhibits gastrin release.