MSF exam 5 practice questions and
Answers 2026
1. Select the correct statement.
a) The parotid gland contributes about 20% of the total saliva volume.
b) The sublingual gland's secretion is mostly serous.
c) Saliva contains a protease.
d) There are hundreds of tiny salivary glands in the oral mucosa. - Correct answer-
not b
2. Which of the following is a purpose of cholecystokinin?
a) Stimulation of gall bladder contractions.
b) Stimulation of pancreatic enzyme release.
c) Stimulation of stomach to empty.
d) All of the former are correct.
e) Both A and B are correct. - Correct answer-e
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,3. Which organ of the GI tract has a layer of smooth muscle that none of the other
organs has?
a) Colon
b) Small intestine
c) Esophagus
d) Stomach - Correct answer-d
4. Lacteals...
a) are found within each microvillus in the small intestine.
b) are capillaries of the small intestine mucosa.
c) absorb lipids and cholesterol into the lymph system.
d) synthesize chylomicrons. - Correct answer-c
5. Absence of a portion of the enteric nervous system in the small intestine could
lead to...
a) a gastrin-producing tumor and intestinal ulceration.
b) intestinal ischemia.
c) malabsorption due to improper digestion.
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,d) intestinal obstruction and constipation. - Correct answer-d
6. The interstitial cells of Cajal...
a) periodically partially depolarize myenteric smooth muscle.
b) periodically stimulate contractions of myenteric smooth muscle.
c) periodically partially depolarize submucosal smooth muscle.
d) periodically stimulate contractions of submucosal smooth muscle. - Correct
answer-a
7. Which of the following will increase the rate at which the stomach empties?
a) Extreme distension.
b) Rhythmic segmentation in the duodenum.
c) Orad region is not very full.
d) Presence of fat in the chyme in the duodenum. - Correct answer-c
8. Select the correct statement.
a) Somatostatin is universally stimulatory to digestive processes.
b) Gastric Inhibitory Peptide is a gut hormone that stimulates insulin release.
c) Saliva contains an enzyme that can begin protein digestion.
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, d) The esophagus contains skeletal muscle, but not smooth muscle. - Correct
answer-b
9. The esophagus has sphincters at both ends because...
a) average intraesophageal pressure is lower than intrathoracic pressure.
b) average intraesophageal pressure is lower than atmospheric and abdominal
pressure.
c) average intraesophageal pressure is higher than abdominal pressure.
d) None of the former is correct. - Correct answer-b
10. Smooth muscle fibers...
a) allow cytoplasm to stream from cell to cell due to gap junctions.
b) have the same ratio of actin to myosin as skeletal muscle.
c) are larger than skeletal muscle fibers.
d) utilize calcium ions during relaxation. - Correct answer-a
11. Which of the following substances would inhibit stomach acid secretion?
a) Gastrin
b) Histamine
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Answers 2026
1. Select the correct statement.
a) The parotid gland contributes about 20% of the total saliva volume.
b) The sublingual gland's secretion is mostly serous.
c) Saliva contains a protease.
d) There are hundreds of tiny salivary glands in the oral mucosa. - Correct answer-
not b
2. Which of the following is a purpose of cholecystokinin?
a) Stimulation of gall bladder contractions.
b) Stimulation of pancreatic enzyme release.
c) Stimulation of stomach to empty.
d) All of the former are correct.
e) Both A and B are correct. - Correct answer-e
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,3. Which organ of the GI tract has a layer of smooth muscle that none of the other
organs has?
a) Colon
b) Small intestine
c) Esophagus
d) Stomach - Correct answer-d
4. Lacteals...
a) are found within each microvillus in the small intestine.
b) are capillaries of the small intestine mucosa.
c) absorb lipids and cholesterol into the lymph system.
d) synthesize chylomicrons. - Correct answer-c
5. Absence of a portion of the enteric nervous system in the small intestine could
lead to...
a) a gastrin-producing tumor and intestinal ulceration.
b) intestinal ischemia.
c) malabsorption due to improper digestion.
©C0PYRIGHT 2025, ALL RIGHTS RESERVED 2
,d) intestinal obstruction and constipation. - Correct answer-d
6. The interstitial cells of Cajal...
a) periodically partially depolarize myenteric smooth muscle.
b) periodically stimulate contractions of myenteric smooth muscle.
c) periodically partially depolarize submucosal smooth muscle.
d) periodically stimulate contractions of submucosal smooth muscle. - Correct
answer-a
7. Which of the following will increase the rate at which the stomach empties?
a) Extreme distension.
b) Rhythmic segmentation in the duodenum.
c) Orad region is not very full.
d) Presence of fat in the chyme in the duodenum. - Correct answer-c
8. Select the correct statement.
a) Somatostatin is universally stimulatory to digestive processes.
b) Gastric Inhibitory Peptide is a gut hormone that stimulates insulin release.
c) Saliva contains an enzyme that can begin protein digestion.
©C0PYRIGHT 2025, ALL RIGHTS RESERVED 3
, d) The esophagus contains skeletal muscle, but not smooth muscle. - Correct
answer-b
9. The esophagus has sphincters at both ends because...
a) average intraesophageal pressure is lower than intrathoracic pressure.
b) average intraesophageal pressure is lower than atmospheric and abdominal
pressure.
c) average intraesophageal pressure is higher than abdominal pressure.
d) None of the former is correct. - Correct answer-b
10. Smooth muscle fibers...
a) allow cytoplasm to stream from cell to cell due to gap junctions.
b) have the same ratio of actin to myosin as skeletal muscle.
c) are larger than skeletal muscle fibers.
d) utilize calcium ions during relaxation. - Correct answer-a
11. Which of the following substances would inhibit stomach acid secretion?
a) Gastrin
b) Histamine
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