Answer: Transitional epithelium
Explanation:
Transitional epithelium is a kind of stratified epithelium which consists of multiple layers of epithelial cells which can expand and contract.
It lines the organs of the urinary system and is also known as urothelium.
The expansion and contraction of this tissue is to provide distension to the tissues. The shape of the transitional epithelium varies as it is columnar at bottom, squamous at top and cuboidal in the middle.