Question

multiple choice question
the image is of a small structure within the small intestine known as a(n)

o villus
o microvillus
o rugae
o haustra

Explanation:

• Villus: These are finger - like projections in the small intestine that increase the surface area for absorption.
• Microvillus: These are even smaller projections (brush border) on the surface of cells (enterocytes) that make up the villi. The question asks for a "small structure within the small intestine" which is more appropriately a villus as a whole structure rather than just the micro - level microvillus.
• Rugae: These are folds in the stomach (not the small intestine) that allow for expansion.
• Haustra: These are sacculations in the colon (large intestine), not the small intestine.

Answer:

villus