This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
Pacemaker cells for the system are located in? 
Select and explain. 
A. Stomach, B. Duodenum, C. Jejunum, D. Large intestine
A: Stomach
Answer: A: Stomach 
Explanation: Ans. (a) Stomach(Ref: Ganong, 25th ed/p.496)Pacemaker cells of GIT are interstitial cells of CajalThey are located in the midbody region of stomach along the greater curvature