Segmentation of the Small Intestine

question 59

Multiple Choice

Segmentation of the small intestine

• A)occurs only between meals,and functions to stimulate the secretion of gastrin and the resulting mass movements that empty the large intestine.
• B)occurs at a rate of 3 contractions per minute throughout the small intestine,although the strength of contractions is much greater in the ileum,which has a much thicker layer of smooth muscle in its walls.
• C)functions mainly to prevent any forward movement of chyme,so that all digestion and absorption is complete before undigestible materials move into the jejunum.
• D)are peristaltic movements that sweep undigestible materials out of the small intestine between meals.
• E)mixes chyme with digestive enzymes,brings food molecules near the wall for absorption,and slowly moves small intestine contents toward the cecum.

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