<prompt> Which of the following pa of the colon has maximum basic electrical rhythm BER?Ascending colonDescending colonSigmoid colonTransverse colon  <response>: Basic electrical rhythm BER is initiated by the interstitial cells of Cajal, stellate mesenchymal pacemaker cells. The rate of the BER is about 4min in the stomach. It is about 12min in the duodenum and falls to about 8min in the distal ileum. In the colon, the BER rate rises from about 2min at the cecum to about 6min at the sigmoid. The function of the BER is to coordinate peristaltic and other motor activity, such as setting the rhythm of segmentation; contractions can occur only during the depolarizing pa of the waves. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 27. Gastrointestinal Motility. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 