Digestive System Overview · Physiology

Which of the following describes a 'short reflex' in the regulation of the digestive system?

  1. A reflex mediated entirely within the enteric nervous system of the gut wall
  2. A reflex involving the spinal cord and the sympathetic trunk ganglia outside the gut
  3. A reflex initiated and coordinated by the central nervous system
  4. A reflex whose signals travel through the vagus nerve to the brainstem
Show answer and explanation

Correct answer: A reflex mediated entirely within the enteric nervous system of the gut wall

Short reflexes are local enteric reflexes where the sensory input and motor output occur entirely within the gut wall without involving the CNS. Long reflexes, by contrast, involve autonomic nerves and the brain or spinal cord.

Difficulty: Medium Question 33 of 39

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