The Perfectly Smooth Walls of the Small Intestine Ensure Food

Question

The perfectly smooth walls of the small intestine ensure food moves through it more efficiently.

Accepted Answer

The small intestine has folds and finger-like projections called villi and microvilli that increase its surface area for better absorption of nutrients. These structures also create a slightly uneven surface, which helps to slow down the movement of food and allows for more thorough mixing with digestive enzymes.