<prompt> The lower esophageal sphincter LES resting pressure is:5-10 mm Hg10-15 mm Hg15-25 mm HgNone of the above  <response>: The LES measures 3-4 cm in length and its resting pressure ranges between 15 and 24 mm Hg. At the time of swallowing, the LES relaxes for 5-10 seconds to allow the food bolus to enter the stomach, and then it regains its resting tone 