What is the length of the lower esophageal sphincter?: (A) l-2cm, (B) 3-5 cm, (C) 0.5-0.8cm, (D) 7-10cm
Answer is B. 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.