A bolus is a(n):
a. sphincter muscle separating the stomach from the small intestine.
b. portion of food swallowed at one time.
c. enzyme that hydrolyzes starch.
d. portion of partially digested food expelled by the stomach into the duodenum.
Question 2
The digestive tract begins at the ____ and ends at the ____.
a. stomach; large intestine
b. pharynx; rectum
c. lower esophageal sphincter; rectum
d. mouth; anus