MEDICAL PHYSIOLOGY

Detailed explanation-1: -Answer and Explanation: C. The epithelial cells that are adapted for absorption and secretion have microvilli. The small protruding structures increase the surface area of the cell so that exchange between the cell and the extra-cellular matrix can be fully facilitated.

Detailed explanation-2: -SIMPLE COLUMNAR EPITHELIUM: The surface of each villus is covered with simple columnar epithelium . The free surface of these cells has very tiny projections called microvilli, which are specialized for absorption (absorptive cells).

Detailed explanation-3: -Epithelial cells have a free surface called the apical surface. We often think of this part of the epithelial cell as the top of the cell, however, the free surface can face any direction so long as it is facing the external environment, such as the opening of a cavity or the surface of the skin.

Detailed explanation-4: -Microvilli are present on the luminal surface of many epithelia, particularly those specialised for absorption. Microvilli increase the area of the free surface of the epithelium available for absorption.

Detailed explanation-5: -Microvilli on the surface of epithelial cells such as those lining the intestine increase the cell’s surface area and thus facilitate the absorption of ingested food and water molecules.