Chapter 35: Gastrointestinal Function

Chapter 35: Gastrointestinal Function

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE
1. The structure and secretions of the salivary gland most closely resemble those of the
a. gastric gland.
b. exocrine pancreas.
c. liver.
d. gallbladder.
ANS: B
The salivary gland and the pancreas both secrete amylase. Gastric glands secrete pepsinogen. The liver and salivary gland do not
resemble each other in the secretory process. The gallbladder secretes concentrated bile salts.
REF: Pg. 712
2. The primary stimulus for pancreatic secretion is
a. gastrin.
b. histamine.
c. acetylcholine.
d. secretin.
ANS: D
Secretin, which is produced by the mucosa of the duodenum in response to the entry of acidic gastric juice from the stomach,
stimulates pancreatic fluid. Gastrin is secreted by endocrine cells of the stomach mucosa in response to food entry. Histamine is not
the primary stimulus for pancreatic secretion. Acetylcholine is not associated with the secretion of pancreatic fluids.
REF: Pg. 705
3. The action of bile is to
a. emulsify fats.
b. digest cellulose.
c. convert sucrose.
d. release free amino acids.
ANS: A
Bile is produced continuously in the liver and is responsible for emulsifying fats. Humans do not secrete an enzyme capable of
digesting cellulose. Sucrase converts sucrose to glucose and fructose. Protein digestion involves the release of free amino acids.
REF: Pg. 711
4. The sympathetic nerve endings in the GI tract secrete
a. acetylcholine.
b. histamine.
c. gastrin.
d. norepinephrine.
ANS: D
The sympathetic nerve endings in the GI tract secrete norepinephrine, which promotes the inhibitory effect of the sympathetic
nervous system on the GI tract. Acetylcholine is not secreted by sympathetic nerve endings in the GI tract. Histamine stimulates
parietal cell secretion. Gastrin is not secreted by sympathetic nerve endings in the GI tract.