What are the functions of the epithelial cell in the villi?

Epithelial cells in the villi of the small intestine serve several essential functions. They primarily facilitate the absorption of nutrients by increasing the surface area for contact with digested food. These cells contain microvilli, which further enhance absorption and secrete digestive enzymes and mucus, aiding in digestion and protecting the intestinal lining. Additionally, they play a role in selective permeability, allowing beneficial substances to enter the bloodstream while keeping out harmful pathogens.