<prompt> Slow waves are maximum inStomachIleumColonRectum  <response>: Among the given options, slow waves are maximum in the ileum. The rate of slow waves in ileum is 8min. Slow waves or Basic Electric rhythmBER refers to the spontaneous rhythmic fluctuation in membrane potential of the GI smooth muscles betwee -65mV and -45mV. These are initiated by the interstitial cells of Cajal. Other options The rate of slow waves in the stomach is 4min and in the colon, it varies between 2 to 6min. Rate of Basal electric rrhythm in various regions Segment Rate of BER Stomach 4min Duodenum 12min Distal ileum 8min Cecum 2min Sigmoid 6min Ref: Ganong;s Review of Medical physiology 26th edition Pgno: 486 