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Questions and Answers
What is the primary purpose of the segmentation motility pattern?
What is the term for the mixture of intestinal contents with digestive juices?
What occurs routinely in the setting of segmentation?
According to the enteric nervous system, how long does the mixing pattern persist?
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What is the name of the motility pattern that is similar to peristalsis but is designed to retard the movement of intestinal contents?
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What system dictates the segmentation motility pattern?
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Study Notes
Segmentation & Mixing
- When a meal is present, the enteric nervous system promotes a motility pattern related to peristalsis, designed to retard the movement of intestinal contents along the intestinal tract.
- This motility pattern, known as segmentation, allows for ample mixing of intestinal contents (chyme) with digestive juices, providing time for digestion and absorption.
- Segmentation involves a segment of bowel contracting at both ends, followed by a second contraction in the center of the segment, forcing chyme both backward and forward.
- Retrograde movement of chyme occurs routinely in segmentation, unlike peristalsis.
- The mixing pattern persists as long as nutrients remain in the lumen to be absorbed.
- Segmentation reflects programmed activity of the bowel, dictated by the enteric nervous system, and can occur independently of central input, although central input can modulate it.
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Description
This quiz covers the enteric nervous system's role in digestion, specifically the motility pattern of segmentation and its relation to peristalsis. It also discusses the importance of mixing intestinal contents with digestive juices.
