Physiology Which of the following statement regarding lower esophageal sphincter is TRUE? A It has no tonic activity B It has a tone which is provided by the sympathetic system C Relaxes on increasing abdominal pressure D Relaxes ahead of the peristaltic wave 💡 Explanation Which of the following statement regarding lower esophageal sphincter is TRUE? ✓ Correct Answer: D. Relaxes ahead of the peristaltic wave