Which of the following is true about epithelia? Which of the following is true about epithelia? Pseudostratified epithelia are commonly keratinized. Stratified epithelia are associated with filtration. Endothelium provides a slick surface lining all hollow cardiovascular organs. Simple epithelia are commonly found in areas of high abrasion.

Endothelium provides a slick surface lining all hollow cardiovascular organs.

Explanation:

Endothelium is a layer made of cells that lines the interior surface of the entire circulatory system from heart to the capillaries. It forms the interface between the blood in the lumen and the vessel wall.

It is a single celled thin layer of squamous cells. It is involved in fluid filtration, maintaining the the blood vessel tone, homeostasis, hormone trafficking and neutrophil recruitment. It is of mesodermal origin. It is aligned in the direction of fluid flow.