Segmentation is fastest at the start of the small intestine. What rate does it reach in the duodenum?

1. Segmentation shoves the contents of the small intestine back and forth rather than driving them onward. 2. It is not uniform along the organ: the rate falls as chyme moves distally. 3. In the duodenum, where segmentation is most rapid, the rate is about 12 times per minute. 4. By the ileum, the rate has dropped to only about eight times per minute. 5. So eight per minute is the ileal figure and is the trap in this question. 6. Twenty and 30 times per minute are both faster than any segmentation rate given for the small intestine. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 23 "The Digestive System", section 23.5 The Small and Large Intestines_