When discussing digestion with a group of nursing students, the instructor asks, "Where does the digestion of our food begin?" The most accurate student response would be
A) The stomach with its hydrochloric acid production
B) The duodenum with common bile duct secretions
C) The mouth with ptyalin and amylase breaking down starches
D) The jejunum, where peristaltic waves begin
Ans: C
Feedback:
Saliva performs three roles: lubrication, antimicrobial protection, and initiation of starch digestion. Saliva contains ptyalin and amylase, which initiate the digestion of dietary starches. The other portions of the GI tract aid in digestion, but all begins in the mouth.
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