exam_1_08_A - PSL 432 Exam 1 Wednesday February 6 2008 Name...

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PSL 432 Exam 1 Wednesday February 6, 2008 Name:_______________________________ 1. Absorption of nutrients by intestinal epithelial cells increases blood flow in the mucosa by A. releasing adenosine. B. decreasing local pO 2 . C. generating hyperosmolarity in the blood. D. releasing CO 2 . E. All of the above are correct. @ 2. Activation of sympathetic nerves decrease blood flow to the gastrointestinal tract by stimulating A. muscarinic receptors on vascular smooth muscle cells. B. NO release from vascular endothelial cells. C. release of the vasoactive hormone cholecystokinin (CCK). D. α -adrenergic receptors on vascular smooth muscle cells. @ E. metabolic activity in intestinal epithelial cells. 3. Stimulation of sympathetic nerves that innervate the GI tract are predicted to increase A. gastric motility. B. intestinal secretion. C. gastric blood flow. D. contraction of the muscularis mucosa. @ E. digestion and absorption of nutrients. 4. Intravenous injection of a hormone initiates intense peristaltic contractions in the distal stomach. Which hormone was most likely injected? A. Acetylcholine B. Gastrin @ C. Cholecystokinin (CCK) D. Secretin E. Somatostatin 5. A hormone that stimulates the migrating motor complex (MMC) was injected into a human subject. Electrical activity and contractile strength was measured in duodenum. Compared to the period before hormone injection, the period of intense contractions of the MMC is characterized by A. an increase in the frequency of slow waves in the duodenum. B. a decrease in the frequency of slow waves in the duodenum. C. an increase in amplitude of slow waves in the duodenum. @ D. a decrease in amplitude of slow waves in the duodenum. E. Both ‘A’ and ‘C’ are correct.
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PSL 432 Exam 1 Wednesday February 6, 2008 Form A 6. Which of the following is the most potent inhibitor of gastric motility and emptying? A. acid in the stomach B. fat in the duodenum @ C. small peptides and amino acids in the stomach D. bicarbonate ion (HCO 3 - ) in the duodenum E. activation of the vagus nerve. 7. Depolarization and repolarization of the slow wave in gastrointestinal smooth muscle involves A. voltage-gated Ca 2+ -channels. B. the cystic fibrosis transmembrane conductance regulator (CFTR). C. Ca 2+ -activated K + -channels. D. the H + -ATPase. E. Both ‘A’ and ‘C’ are correct. @ 8. Intrinsic factor A. is synthesized and secreted from gastric chief cells. B. dissociates from vitamin B12 in low pH environments. @
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This note was uploaded on 04/03/2008 for the course PSL 432 taught by Professor Several during the Spring '08 term at Michigan State University.

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exam_1_08_A - PSL 432 Exam 1 Wednesday February 6 2008 Name...

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