Fill in the blank with the best possible answer.

1		The lips are more properly called the .
2		The teeth immediately in the front of the mouth are called .
3		The structure that connects the mouth and stomach is called the .
4		The cells produce pepsinogen.
5		The most important hormone regulating gastric secretions is called .
6		When the region of the stomach stretches it causes the stomach to empty into the duodenum.
7		The duodenum, , and ileum are the parts of the small intestine.
8		The small intestine is lined by epithelium.
9		The produces bile.
10		The stores bile.
11		The duct is formed by the union of duct from the liver and gall bladder.
12		The hormone cause the gall bladder to release bile.
13		The turn in the large intestine near the liver is called the flexure.
14		If the small intestine is stretched too much the reflex will be triggered.
15		The gives humans some voluntary control over defecation.