What causes relaxation of esophageal sphincter?

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Tags

1. #causing
2. #called
3. #encircles
4. #entrance
5. #stomach
6. #pepsin
7. #lower
8. #caused
9. #esophagus
10. #emptying
11. #relaxation
12. #gastric
13. #irritation
14. #prolonged
15. #delayed
16. #sphincter
17. #muscle
18. #esophageal