Transitional epithelium is a specialized type of tissue found in the urinary system, particularly in the bladder, ureters, and urethra. It is unique because it can stretch and change shape, allowing these organs to expand when filled with urine and contract when empty. This flexibility is essential for accommodating varying volumes of liquid. The cells in transitional epithelium are layered and can appear cuboidal or flattened, depending on whether the tissue is relaxed or stretched. This adaptability helps protect underlying tissues from the potentially harmful effects of urine, maintaining the integrity of the urinary tract.