Segmentation of the small intestine
A. are peristaltic movements that sweep undigestible materials out of the small intestine between meals.
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. mixes chyme with digestive enzymes, brings food molecules near the wall for absorption, and slowly moves small intestine contents toward the cecum.
D. occurs only between meals, and functions to stimulate the secretion of gastrin and the resulting mass movements that empty the large intestine.
E. functions mainly to prevent any forward movement of chyme, so that all digestion and absorption is complete before undigestible materials move into the jejunum.
Answer: C
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