Question

what feature of the small intestine greatly expands its surface area, facilitating absorption?
rugae
haustrae
microvilli
none of the above

Explanation:

• Rugae are folds in the stomach, not the small intestine, for expanding stomach volume.
• Haustrae are pouches in the large intestine, aiding in movement of feces.
• Microvilli are tiny, finger-like projections on the surface of small intestine epithelial cells that drastically increase surface area to enhance nutrient absorption.

Answer:

Microvilli