Final answer:
The ileum is spiraled like a corkscrew to facilitate absorption in the small intestine. The circular folds cause the chyme to spiral through the ileum, slowing down its movement and allowing for better nutrient absorption.
Step-by-step explanation:
The ileum is spiraled like a corkscrew to facilitate absorption in the small intestine. The circular folds, also known as plica circulares, in the mucosa and submucosa cause the chyme to spiral through the ileum instead of moving in a straight line. This spiraling slows down the movement of chyme, providing more time for nutrients to be fully absorbed.