4)Gastrointestinal Tract and Digestive System Quiz
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Questions and Answers

Which cranial nerve nucleus contains alpha-motoneurons that supply the muscles of the palate, pharynx, and larynx?

  • Chewing center
  • Nucleus ambiguus (correct)
  • Cranial nerve XII nucleus
  • Trigeminal mesencephalic nucleus
  • Which nucleus has alpha-motoneurons that supply the intrinsic and extrinsic muscles of the tongue?

  • Chewing center
  • Cranial nerve XII nucleus (correct)
  • Nucleus ambiguus
  • Trigeminal mesencephalic nucleus
  • What is the name of the brainstem center that comprises the central neural pattern generator for chewing?

  • Nucleus ambiguus
  • Chewing center (correct)
  • Cranial nerve XII nucleus
  • Trigeminal mesencephalic nucleus
  • Which component of chewing can be overridden by voluntary control?

    <p>Involuntary component</p> Signup and view all the answers

    What is the unique feature of the trigeminal mesencephalic nucleus?

    <p>It is the only site in the body where primary cell bodies are located within the CNS.</p> Signup and view all the answers

    How do orofacial muscles compensate for the weakness of reciprocal innervation due to the lack of proprioceptors?

    <p>Through powerful regulatory influences from afferent impulses</p> Signup and view all the answers

    What type of hormone is GLP-1 classified as?

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

    Which hormone is secreted by D cells of the gastrointestinal mucosa in response to decreased luminal pH?

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

    What is the primary function of histamine secreted by cells in the stomach?

    <p>Stimulate gastric acid secretion</p> Signup and view all the answers

    Which type of hormone is synthesized in cell bodies of gastrointestinal neurons?

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

    What effect does somatostatin have on other gastrointestinal hormones?

    <p>Inhibits their secretion</p> Signup and view all the answers

    Which cells secrete GLP-1 in the small intestine?

    <p>L cells</p> Signup and view all the answers

    What neurotransmitter do postganglionic nerve fibers release?

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

    Which plexuses can postganglionic nerve fibers synapse on?

    <p>Myenteric and submucosal plexuses</p> Signup and view all the answers

    What effect does gastrin have on gastric motility?

    <p>Stimulates ileal motility</p> Signup and view all the answers

    How is gastrin secretion inhibited?

    <p>By negative feedback from acid accumulation in the stomach</p> Signup and view all the answers

    What stimulates the release of cholecystokinin (CCK)?

    <p>Fat and other nutrients entering the duodenum</p> Signup and view all the answers

    How does CCK affect the digestive system?

    <p>Stimulates bile release from the gallbladder</p> Signup and view all the answers

    During which phase of the slow waves in the gastrointestinal tract does the balance of inward calcium current and outward potassium current occur?

    <p>Phase 3</p> Signup and view all the answers

    What is the frequency of electrical slow waves in the human antrum?

    <p>3 waves/min</p> Signup and view all the answers

    What initiates changes in sphincter pressure for gastrointestinal tract contents to move through?

    <p>Smooth muscle contractions in adjacent organs</p> Signup and view all the answers

    Which type of muscle action potentials appear at the crests of the slow waves in the gastrointestinal tract?

    <p>Sharp upward-downward deflections</p> Signup and view all the answers

    What is the characteristic of muscle contractions associated with each slow wave?

    <p>Small contractions with no action potentials</p> Signup and view all the answers

    Which phase of the slow waves is characterized by activation of voltage-gated calcium channels?

    <p>Phase 1</p> Signup and view all the answers

    What drives colonic contents into the distal part of the large intestine?

    <p>Mass movements</p> Signup and view all the answers

    How many times per day can mass movements occur?

    <p>1 to 3 times</p> Signup and view all the answers

    Which reflex triggers mass movements in the colon primarily?

    <p>Gastrocolic reflex</p> Signup and view all the answers

    What is responsible for making the fecal contents of the large intestine semisolid?

    <p>Water absorption</p> Signup and view all the answers

    What reflex moves remaining small intestine contents into the large intestine?

    <p>Gastroileal reflex</p> Signup and view all the answers

    Which reflex triggers the defecation reflex by pushing colonic contents into the rectum?

    <p>Gastrocolic reflex</p> Signup and view all the answers

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