Which structure in the gastrointestinal tract is involved in the continuous replacement of enterocytes?

Term for surgically creating an opening into the esophagus 

The evaluation of a skeletal muscle motor unit using an intramuscular insertion is called a/an

What is the correct term for surgical removal of a mammary gland 

Term for surgically creating an opening into the esophagus 

“Elevated antibody levels to a particular pathogen” is an example of subjective clinical criteria for a case definition.

Term for inflammation of the stomach, small intestines, and large intestines: 

Which structure is the arrow pointing to in the figure?  

Surgical incision into a muscle 

Which structure is the arrow pointing to in the figure?