Do segmentation move chyme in only one direction?

Yes, segmentation primarily moves chyme in one direction, but its main purpose is to mix the chyme thoroughly with digestive enzymes and facilitate nutrient absorption. This process involves rhythmic contractions of the circular muscles in the intestinal wall, which help break up the chyme and expose it to the intestinal lining. While segmentation does create some movement along the intestine, peristalsis is responsible for the primary forward movement of chyme through the digestive tract.