BRS GI PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
1 view 0 purchase
Course
BRS PHYSIOLOGY
Institution
BRS PHYSIOLOGY
BRS GI PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
1. Which of the following substances is released from neurons in the GI tract and produces smooth muscle relaxation?
(A) Secretin
(B) Gastrin
(C) Cholecystokinin (CCK)
(D) Vasoactive intestinal peptid...
1. Which of the following substances is released from neurons in the GI tract and
produces smooth muscle relaxation?
(A) Secretin
(B) Gastrin
(C) Cholecystokinin (CCK)
(D) Vasoactive intestinal peptide (VIP)
(E) Gastric inhibitory peptide (GIP)
1. The answer is D [II C 1]. Vasoactive intestinal peptide (VIP) is a gastrointestinal (GI)
neurocrine that causes relaxation of GI smooth muscle. For example, VIP mediates the
relaxation response of the lower esophageal sphincter when a bolus of food approaches
it, allowing passage of the bolus into the stomach.
2. Which of the following is the site of secretion of intrinsic factor?
(A) Gastric antrum
(B) Gastric fundus
(C) Duodenum
(D) Ileum
(E) Colon
, 2. The answer is B [IV B 1; Table 6-3; Figure 6-7]. Intrinsic factor is secreted by the
parietal cells of the gastric fundus (as is HCl). It is absorbed, with vitamin B12, in the
ileum.
3. Vibrio cholerae causes diarrhea because it
(A) increases HCO3- secretory channels in intestinal epithelial cells
(B) increases Cl- secretory channels in crypt cells
(C) prevents the absorption of glucose and causes water to be retained in the
intestinal lumen
isosmotically
(D) inhibits cyclic adenosine monophosphate (cAMP) production in intestinal
epithelial cells
(E) inhibits inositol 1,4,5-triphosphate (IP3) production in intestinal epithelial cells
3. The answer is B [V D 4 c]. Cholera toxin activates adenylate cyclase and increases
cyclic adenosine monophosphate (cAMP) in the intestinal crypt cells. In the crypt cells,
cAMP activates the Cl--secretory channels and produces a primary secretion of Cl-, with
Na+ and H2O following.
4. Cholecystokinin (CCK) has some gastrin-like properties because both CCK and
gastrin
(A) are released from G cells in the stomach
(B) are released from I cells in the duodenum
(C) are members of the secretin-homologous family
(D) have five identical C-terminal amino acids
(E) have 90% homology of their amino acids
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller AcademicSuperScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
