Question

question 83 (0.5 points) which of the following increase the surface area for absorption in the small intestine? circular folds (plica circularis) villi (villus) microvilli all of these

Explanation:

To determine which structures increase the surface area for absorption in the small intestine:

• Circular folds (plica circularis) are large, permanent folds in the small intestine's lining that increase surface area.
• Villi (villus) are finger - like projections on the intestinal lining, and each villus further increases the surface area.
• Microvilli are tiny projections on the surface of intestinal epithelial cells (the brush border), which also enhance the surface area.

Since circular folds, villi, and microvilli all contribute to increasing the surface area for absorption in the small intestine, the correct option is "all of these".

Answer:

D. all of these (assuming the options are labeled A - D with D being "all of these"; if the original options have "all of these" as the last option, the answer is the option with "all of these" text, e.g., if the options are as given with "all of these" as the fourth option, the answer is the fourth option: all of these)