Final answer:
The cotton roll may pull on the lining mucosa due to the presence of the muscularis mucosae.
Step-by-step explanation:
The cotton roll may pull on the lining mucosa because of the presence of the muscularis mucosae. The muscularis mucosae is a thin layer of smooth muscle that is constantly in tension, pulling the mucosa of the stomach and small intestine into undulating folds. These folds increase the surface area available for digestion and absorption.