Final answer:
The movements unique to the large intestine are mass movements, which are strong waves propelling the contents toward the rectum. They occur three or four times per day and play a crucial role in moving semi-solid waste through the large intestine for elimination.
Step-by-step explanation:
The movements unique to the large intestine are mass movements. These movements, also known as mass peristalsis or gastrocolic reflex, are strong waves that start in the transverse colon and propel the contents toward the rectum. They occur three or four times per day, usually after eating, and play a crucial role in moving semi-solid waste through the large intestine for elimination.