Review, and challenge, are an important part of learning. This quiz is part of a set that will span the abdominal physiology and anatomy to challenge your synoptic linking ability. Good luck!
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Gastrointestinal Physiology Review MCQ - Part 7
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Distention of which mural structure causes occlusion of the ileocaecal valve?
Question 1 Explanation:
Mural is a commonly used term in histology to describe the wall of something - an example being that Crohn's can be distinguished from ulcerative colitis by the former having transmural inflammatory signs verses just mucosal changes in UC.
For 150g of stored faeces, how much is water?
Chyme undergoes propulsion and retropulsion in the large bowel. This is termed?
Mass migratory movement
Migrating motor complex
Chyme undergoes propulsion and retropulsion in the large bowel. What is the purpose of this process?
Absorption of water
Absorption of glucose
Absorption of bile acid
Absorption of lecithin
Absorption of cobalamin
Propulsive movement occurs on a large-order scale multiple times a day in the large intestine. In this circumstance, what is the initial trigger?
Active mechanoreception stimulation of the gastric mucosa
Duodenal content peristalsis
What is the initial response of the external anal sphincter to the defecation reflex?
There is no initial change
Involvement in the peristaltic wave
A patient is recovering from a stroke that has damaged descending fibres involved in the conscious regulation of defecation. What reflex has the patient lost?
Closing of the internal anal sphincter
Closure of the external anal sphincter
Opening of the internal anal sphincter
Inhibition of the anal canal's smooth muscle cellular contraction
The majority of cell type in the colonic mucosa is
The chloride shift within the large intestine occurs
Across the apical border into the cell
Across the apical border out of the cell
Across the basolateral border into the cell
Across the basolateral border out of the cell
There is no chloride shift in the large intestine
Ceftriaxone risks death of microbiota in the large intestine more than other regions because
Ceftriaxone is more efficacious in this region
The drug is actively transported from the enterocyte
There are preferential complementary receptors for ceftriaxone macromolecule in the ascending and transverse colon
The large intestine has a higher pH than the more proximate bowel
The large intestine contains more substrate for facultative anaerobic bacteria
Question 10 Explanation:
The large bowel is less acidic than other regions of the intestine. This means that they are a more hospitable environment for gut bacteria. This means, consequently, that antibiotic damage to microbiota is more likely to occur where the vast majority of the bacteria are - the large intestine.
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