Talk about microvilli.

Finger like permanent and stable structure, 1-2 microm length and 0.1 microm diameter, surface of epithelia, involved in absorption (enterocytes) or secretion, appear as a brush in apical pole, increase cell surface area making absorption more effective. internally supported by 40 actin filaments, connected to cytoskeleton and plasma membrane covering them, actin filaments are connected by other proteins (villin and fimbrin) and play a supportive role and mobility role, causing material flow. Usually covered by viscous glycoproteins and carbs called glycocalyx, facilitating their movement.