Which feature increases absorptive surface area in the small intestine epithelium?

Study for the CAMLPR Histology Practice Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Absorptive surface area in the small intestine is increased by microvilli, tiny fingerlike projections on the apical surface of enterocytes that form the brush border. These microscopic extensions extend the cell membrane, boosting the area available for nutrient contact and housing digestive enzymes, which makes absorption much more efficient. Stereocilia are long immotile extensions found in other tissues, cilia are motile and move mucus or fluids along surfaces, and flagella propel cells like sperm; none of these primarily serve nutrient absorption in the intestinal lining.