EXAM 3 PGY451551 F08

EXAM 3 PGY451551 F08 - 1. In the GI tract, you observe a...

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1. In the GI tract, you observe a tissue layer that consists of loose connective tissue that contains large blood vessels, lymph vessels and one of the plexi of the enteric nervous system. You are observing the: A. mucosa B. submucosa C. muscularis externa D. serosa 2. Orally administered drugs that are intended to treat disorders of the central nervous system often have side effects on the digestive system. Which of the following is NOT a credible explanation for this phenomenon? A. The central nervous system innervates the enteric nervous system B. The enteric nervous system shares many neurotransmitters with the central nervous system C. The highest concentrations of these drugs occurs in the digestive system since this is where they are absorbed. D. The liver metabolizes these drugs after they are absorbed by the digestive system and before they reach the brain. 3. The plasma membrane of a smooth muscle cell is generating regular slow waves but the tension produced by the contraction of the cell is very weak. Most likely, the cell is generating slow waves that: A. reach threshold for contraction, but do not reach electrical threshold for generating action potentials B. reach threshold for contraction and do reach electrical threshold for generating action potentials C. do not reach threshold for contraction, but do reach electrical threshold for generating action potentials D. do not reach threshold for contraction and do not reach electrical threshold for generating action potentials 4: All of the following events occur during swallowing with one exception. What is the EXCEPTION? A. Tongue moves bolus upward and backward toward pharynx B. Upper esophageal sphincter relaxes C. Primary peristalsis occurs along esophagus D. Epiglottis blocks larynx (windpipe) E. Lower esophageal sphincter constricts 5. The description of the following type of motility is consistent with which region of the gastrointestinal tract? Peristaltic contractions move the contents aborally toward a closed sphincter. A small volume of the contents is propelled through sphincter. Most of contents are retropulsed orally and are mixed.
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A. esophagus B. stomach C. small intestine D. large intestine 6. Order the events of defecation in the proper order from first to last. 1. Relaxation of the internal anal sphincter
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This note was uploaded on 11/10/2010 for the course PGY Phisiology taught by Professor Dr.beizer during the Spring '10 term at SUNY Buffalo.

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EXAM 3 PGY451551 F08 - 1. In the GI tract, you observe a...

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