Segmentation contractions:
A) occur in the stomach
B) are suppressed by acetylcholine
C) are initiated by pacemaker cells
D) occur in the colon
E) quickly propel chyme through the small intestines

Question

Quizplus · Accepted Answer

Segmentation contractions are initiated by pacemaker cells, which are located in the circular muscles of the digestive tract. These contractions help to mix and grind food in the small intestine, allowing for better absorption of nutrients. Segmentation contractions do not occur in the stomach or colon, and they do not rapidly propel chyme through the small intestines like peristaltic contractions do. Acetylcholine actually stimulates segmentation contractions, rather than suppressing them.

Segmentation Contractions