Which of the following is NOT a function of microvilli?

Microvilli are specialized structures found on the surface of certain epithelial cells, particularly those involved in absorption, such as the intestinal lining. Their primary role is to dramatically increase the surface area available for absorption, which is crucial for efficient nutrient uptake. Therefore, options concerning the enhancement of surface area for absorption and nutrient uptake correctly represent the function of microvilli.

While microvilli play a role in facilitating cellular transport by increasing the surface area that comes into contact with the surrounding environment, option regarding the secretion of digestive enzymes does not align with the primary functions of microvilli. Instead, the production and secretion of digestive enzymes are typically the responsibility of specific cells, notably gland cells such as those in the pancreas and the stomach lining, rather than microvilli themselves. This distinction helps clarify why the claim about secreting digestive enzymes is not a function of microvilli.