King's Day (formerly Queen's Day) in Amsterdam. King's Day 2016 - Koningsdag 2016 is the Dutch national holiday to be held on Monday 27 April 2016.
Lesson Summary. Transitional epithelium is a layer of cells that form the mucosal lining of your ureters, a portion of your urethra, and your urinary bladder. The cells are stratified, which means they create several layers. These cells provide protection and allow the vessels to expand to accommodate fluid.
Epithelia are sheets of cells that provide the interface between masses of cells and a cavity or space (a lumen). 1  The portion of the cell exposed to the lumen is called its apical surface.  The rest of the cell (i.e., its sides and base) make up the basolateral surface.