In Science, we were all assigned groups. Each group had to study a body system. Margaret, Io and I all did the Urinary system. We learned about structure meets function. Transitional epithelium is a type of tissue consisting of multiple layers of epithelial cells which can contract and expand. It is so named because of this function in the transition of degree of distension. This tissue structure type is found in urothelium, including that of the urinary bladder, the ureters, and the superior urethra and gland ducts of the prostate. When the bladder is empty, it looks like an inverted pyramid but when it’s full, it’s shaped like an oval. In the base of the bladder, there’s a structure called a trigone, which is the triangular area made up of the openings from the ureters and the opening into the urethra.