<prompt> What is the length of the lower esophageal sphincter?l-2cm3-5 cm0.5-0.8cm7-10cm  <response>: Ans. is b i.e., 3-5 cm Ref: McGraw-Hill Concise Dictionary of Modem Medicine. 2002 by The McGraw-Hill Companies, Inc. Lower esophageal sphincter is a zone of 3-5 cm located at the junction of the distal esophagus and gastric cardia acting as a physical barrier in preventing gastric reflux. 