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Urothelium (or uroepithelium) is an example of transitional epithelium. It is the type of epithelium that lines much of the urinary tract including the renal pelvis, the ureters, the bladder, and parts of the urethra.
â¢ Transitional epithelial cells, or urothelium, are cells found in the ureter, bladder, and renal pelvis. These cells consist of multiple layers that expand or contract such as in the case of the bladder when it is full. They work to accommodate liquid volume and protect against the effects of the urine.