What is found at the apical surface of epithelial cells lining the small intestine?

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!

The apical surface of the epithelial cells lining the small intestine is covered by microvilli, forming a brush border that greatly increases surface area for nutrient absorption. These tiny, actin-supported projections host digestive enzymes and transporters on their membranes, enhancing digestion and uptake. Cilia are not present on these enterocytes; they are motile structures found in places like the airway and fallopian tubes. Stereocilia resemble microvilli but are much longer and occur in the epididymis and inner ear hair cells, not in the small intestine. Flagella are whip-like structures used for cell movement, seen in sperm and some bacteria, not on ordinary intestinal lining cells. So the apical surface features microvilli.