The ring of muscle at the junction of the oesophagus and the stomach is called the
- A. pyloric sphincter
- B. ileocaecal valve
- C. anal sphincter
- D. cardiac sphincter
Explanation
The cardiac sphincter opens to admit food and closes to stop acid reflux into the oesophagus. The pyloric sphincter guards the stomach's exit, and mixing these two up is a classic error.
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