This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
What is the rate of BER in the stomach? 
Select and explain. 
A. About 1.5/min in the stomach., B. About 15/min in the stomach., C. About 4/min in the stomach., D. About 0.4/min in the stomach.
C: About 4/min in the stomach.
Answer: C: About 4/min in the stomach. 
Explanation: About 4/min in the stomach. Basic Electrical Rhythm (BER): Smooth muscle cells of the gastrointestinal tract have spontaneous rhythmic fluctuations in membrane potential between about -65 and -45 mV. BER initiated by Pacemaker cells called "Interstitial cells of Cajal" Metrics: The threshold for the action potential is -50 mV. The rate of BER: About 4/min in the stomach. About 12/min in duodenum About 8/min - distal ileum (falls down) In Colon: Rate rises from about 2/min at Cecum -----------> about 6 min at the Sigmoid colon.