<prompt> What is the rate of BER in the stomach?About 1.5min in the stomach.About 15min in the stomach.About 4min in the stomach.About 0.4min in the stomach.  <response>: About 4min 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 4min in the stomach. About 12min in duodenum About 8min - distal ileum falls down In Colon: Rate rises from about 2min at Cecum --- about 6 min at the Sigmoid colon. 