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Fill in the blanks:  1. The Opening of...

Fill in the blanks: 
1. The Opening of the stomach in duodenum is regulated by ....a....
2. Opening of the common hcpato-pancreatic duct is guarded by a structure called ...b….
3. The structure which prevents the back flow of faecol matter is called ...c...
4. A muscular structure that regulates the opening of oesophagus into stomach is called ..d..

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