The Living World 8th Edition by George Johnson

تمرين 11

Although the stomach is normally thought of as the major player in the digestive process, the bulk of chemical digestion actually occurs in the
A) mouth.
B) appendix.
C) duodenum.
D) large intestine.
The small intestine is specialized for absorption because it
A) is the last section of the digestive tract and retains food the longest.
B) has saclike extensions along its length that collect food.
C) has no outlet so food remains within it for longer periods of time.
D) has an extremely large surface area that allows extended exposure to food.
The purpose of the villi and microvilli in the small intestine is to
A) neutralize stomach acid.
B) produce bile.
C) produce digestive enzymes.
D) increase the surface area of the small intestine for the absorption of nutrients.