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Questions and Answers

What is the function of the tunica serosa in the stomach?

  • Creates haustra in the large intestine
  • Forms greater and lesser omenta (correct)
  • Forms mesenteries attaching organs to the posterior abdominal wall
  • Contains white fibrous connective tissue connecting esophagus to mediastinal structures
  • Which part of the esophagus contains a combination of skeletal and smooth muscle?

  • Lower 1/3
  • Entire esophagus
  • Upper 1/3
  • Middle 1/3 (correct)
  • What is unique about the muscular layers of the stomach?

  • They contain both skeletal and smooth muscle
  • They have an outer layer that is circular
  • They contract behind the food bolus
  • They have an inner layer that is oblique (correct)
  • What forms the haustra in the large intestine?

    <p>Teniae coli</p> Signup and view all the answers

    What is the function of the tunica submucosa?

    <p>Contains blood vessels and nerves</p> Signup and view all the answers

    Which part of the small intestine contracts behind the food bolus?

    <p>Inner circular smooth muscle</p> Signup and view all the answers

    Which part of the gastrointestinal tract is responsible for the chemical breakdown of materials by acid and enzymes?

    <p>Stomach</p> Signup and view all the answers

    What is the primary arterial supply during embryonic development for the Foregut region of the GI system?

    <p>Celiac trunk</p> Signup and view all the answers

    Which structure is NOT part of the large intestine?

    <p>Duodenum</p> Signup and view all the answers

    Where does most absorption take place in the small intestine?

    <p>Jejunum</p> Signup and view all the answers

    Which region of the gut tube extends from the distal half of the duodenum to the splenic flexure of the colon?

    <p>Midgut</p> Signup and view all the answers

    Where is the pyloric sphincter located?

    <p>As part of the pylorus below the body of the stomach</p> Signup and view all the answers

    What is the function of VIP in the gastrointestinal system?

    <p>Regulating smooth muscle contraction</p> Signup and view all the answers

    Which ions enter the smooth muscle fibers upon slow waves?

    <p>Sodium ions only</p> Signup and view all the answers

    What is the nickname given to the Enteric Nervous System (ENS)?

    <p>Little Brain</p> Signup and view all the answers

    What effect does sympathetic activity have on intestinal smooth muscle?

    <p>Causes muscle relaxation</p> Signup and view all the answers

    Which plexus is responsible for controlling local intestinal secretion and absorption?

    <p>Submucosal plexus</p> Signup and view all the answers

    Where do sensory fibers pass from before reaching the enteric plexuses and prevertebral ganglia?

    <p>The luminal epithelium and gut wall</p> Signup and view all the answers

    Which neurotransmitter is responsible for inhibiting intestinal tract smooth muscle?

    <p>Norepinephrine</p> Signup and view all the answers

    Which plexus is mainly responsible for stimulating gland secretions and contraction of the muscularis mucosae in the intestines?

    <p>Submucosal plexus</p> Signup and view all the answers

    Which part of the spinal cord do parasympathetic preganglionic neurons for the hindgut arise from?

    <p>S2-S4</p> Signup and view all the answers

    Where do sympathetic postganglionic neurons terminate in the enteric nervous system?

    <p>Myenteric plexus</p> Signup and view all the answers

    Which part of the gut is mainly innervated by sacral parasympathetic preganglionic neurons?

    <p>Distal large intestine</p> Signup and view all the answers

    Where does water absorption occur in the gastrointestinal tract, from the greatest to the smallest amount?

    <p>Jejunum, ileum, colon, feces</p> Signup and view all the answers

    Which hormone is released from the duodenal mucosa in response to the presence of fat, carbohydrate, or protein in the duodenum postprandially?

    <p>Cholecystokinin</p> Signup and view all the answers

    Which part of the gastrointestinal structure includes the cecum?

    <p>Large intestine</p> Signup and view all the answers

    What is the function of the interstitial cells of Cajal?

    <p>Generation of electrical slow waves for gut motility</p> Signup and view all the answers

    Which condition is characterized by significantly delayed gastric emptying and is a common complication of poorly controlled diabetes mellitus?

    <p>Gastroparesis</p> Signup and view all the answers

    What are the typical signs and symptoms associated with paralytic ileus?

    <p>Nausea/vomiting, abdominal distension, absent bowel sounds</p> Signup and view all the answers

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