Which sphincter in the gastrointestinal tract is under voluntary control by the nervous system? A. external anal sphincter B. ileocaecal sphincter C. internal anal sphincter D. lower oesophageal sphincter E. pyloric sphincter
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Along this tract, there are several sphincters, which are circular muscles that act as valves to control the flow of food and waste. The lower esophageal sphincter (LES) is located at the junction between the esophagus and the stomach. Its main function is to Show more…
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