All epithelia have two surfaces an apical surface and a basal surface that differ in both structure and function. This property is called polarity?

Polarity in epithelial tissues refers to the distinct structural and functional differences between the apical and basal surfaces. The apical surface typically faces the external environment or internal cavities and may have specialized features like microvilli or cilia, aiding in absorption or movement. In contrast, the basal surface anchors the epithelium to the underlying connective tissue and often interacts with the extracellular matrix, playing a crucial role in cell signaling and nutrient exchange. This polarity is essential for the proper functioning of epithelial tissues in various roles, such as protection, secretion, and absorption.