Enteric Nervous System and GI Plexes Quiz
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Questions and Answers

What is the function of the VAGO-VAGAL (long) REFLEX in the gastrointestinal tract?

  • Sensory: transmits pain signals to the CNS
  • Inhibitory: decreases motility, inhibits secretion, vasoconstrictive
  • Regulatory: modulates enzyme production and absorption
  • Stimulatory: increases motility, secretomotor, vasodilatory (correct)

    • Where are the MYENTERIC PLEXUS and SUBMUCOSAL PLEXUS located in the gastrointestinal tract?

  • Embedded within the Muscularis Mucosae
  • Within the lumen of the GI tract
  • Adjacent to the serosa layer
  • Between the two layers of musculature and in the submucosa, just outside the Muscularis Mucosae (correct)

    • How do sympathetics primarily inhibit the GI-Tract?

  • By directly stimulating smooth muscle contraction
  • By modulating the activity of the enteric nervous system
  • By presynaptic inhibition, inhibiting release of ACh (correct)
  • By enhancing the release of ACh

    • What is the role of Intestino-Intestinal (short) REFLEX in the gastrointestinal tract?

    <p>Generally inhibitory, involving only the Enteric NS, and completely independent of the Autonomic NS</p> Signup and view all the answers

    What effect does Norepinephrine have on GI-Motility when it acts on smooth muscle?

    <p>Decreases GI-Motility</p> Signup and view all the answers

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