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A 2-year-old boy swallows a penny. The boy's mother checks his stool for several
days, but the
penny does not appear. Meanwhile, the boy has lost his appetite and seems to
have difficulty
eating. When a foreign object is swallowed, it often lodges at which portion of the
gut?
A. Anus
B. Duodenum
C. Ileocecal sphincter
D. Lower esophageal sphincter
E. Pharynx
F. Pyloric sphincter
G. Rectum - ANSD. Lower esophageal sphincter
A 22-year-old man is fed intravenously for several weeks following a severe
automobile
accident. The intravenous feeding leads to atrophy of the gastrointestinal mucosa
most likely
because the blood level of which of the following hormones is reduced?
,A. Cholecystokinin only
B. Gastrin only
C. Secretin only
D. Gastrin and cholecystokinin
E. Gastrin and secretin
F. Secretin and cholecystokinin - ANSB. Gastrin only
A 23-year-old man consumes a meal containing a large amount of fat. At which of
the following
locations are bile salts most likely to be absorbed?
A. A
B. B
C. C
D. D - ANSD. D
A 24-year-old male graduate student participates in a clinical research study on
intestinal
motility. Peristalsis of the small intestine
A. Involves contraction of smooth muscle behind the food bolus and relaxation of
smooth
muscle in front of the bolus
B. Mixes the food bolus
C. Is coordinated by the central nervous system (CNS)
,D. Involves contraction of smooth muscle behind and in front of the food bolus
E. Involves relaxation of smooth muscle simultaneously throughout the small
intestine - ANSA. Involves contraction of smooth muscle behind the food bolus
and relaxation of smooth
A 24-year-old marine visits a physician because of nausea, abdominal pain, and
type 7 stools.
The marine had waded through rivers during combat missions that contained raw
sewage from
the local population. The physician administers a proton pump inhibitor and
several antibiotics,
and within a few weeks, all the symptoms go away. Which of the following best
describes the
condition for which the marine was treated?
A. Excessive alcohol consumption
B. Helicobacter pylori infection
C. Posttraumatic stress syndrome
D. Psychogenic diarrhea
E. Ulcerative colitis
(This was on there twice) - ANSB. Helicobacter pylori infection
A 24-year-old woman drinks one cup of decaffeinated coffee with no sugar or
cream. Which of
, the following gastrointestinal hormones is most likely to be elevated before entry
of coffee into
the duodenum?
A. Cholecystokinin
B. Gastrin
C. Glucose-dependent insulinotropic peptide
D. Motilin
E. Secretin - ANSB. Gastrin
A 28-year-old medical student consumes a cheeseburger, fries, and chocolate
shake. The meal
stimulates the release of several gastrointestinal hormones. The presence of fat,
carbohydrate,
or protein in the duodenum stimulates the release of which hormone from the
duodenal
mucosa?
A. Cholecystokinin
B. Glucose-dependent insulinotropic peptide
C. Gastrin
D. Motilin
E. Secretin - ANSB. Glucose-dependent insulinotropic peptide